Prime and composite numbers. How to tell if larger number is prime | Team MAST


Apart from covering up the definitions of prime and composite number, this video covers up the shortest trick to check if a number is prime or not. After watching this video it won’t take you more than 5 seconds to conclude whether number is prime or not (irrespective of the length of a number). Prime and composite numbers. How to tell if larger number is prime or not ? This video starts with definition of prime numbers where I explain what exactly are prime numbers. So to directly switch on to that part of this video you can just click : After that I cover up the definition of composite numbers where I explain what exactly are composite numbers. So to directly switch on to that part of this video you can just click : Then I discuss the trick to find out whether a number is prime not (covering up few examples). So to directly switch on to that part of this video you can just click : At last I discuss the common confusion generally interpreted out from this trick : You would also like to watch : 1) Vedic maths multiplication of two digit numbers -: 2) Vedic maths multiplication of three digit numbers -: 3) Vedic math multiplication using base method (for 2, 3, 4 digit numbers) -: 4) Vedic math multiplication for series 11…. -: 5) Vedic math multiplication for series 999….. -: 6) Cube root of a number using Vedic Math -: 7) Square root of a number in 5 seconds -: 8) Square of 2 and 3 digit numbers using Vedic Math -: 9) Cube using Vedic Math -: You can also see our whole collection of aptitude videos here : If you wish to remain updated with our latest tutorials you can subscribe to our channel : What we provide ? SHORTCUT TRICKS, Square Root of a Number, SSC IBPS GATE exam preparation PO competitive exams, competitive exams tricks and tips for IBPS, competitive exam, how to, videos, best, english, all, online, top, interview, bank, tips, cat, tutorials, po, lessons, techniques, maths, classes, prepare, ielts, answers, sbi, reasoning, shortcuts, professional, bank po, ssc, exams, with examples, materials, mba, educational, ibps, IELTS, bank, PO, SBI, RBI, Exams, preparation, maths tricks, English, maths, maths short cuts, preparation for English, gk, maths in Hindi, questions, study tips, how to crack, general science, reasoning tricks, clerk exam preparation, po preparation, simplification, BODMAS rule, quantitative aptitude, solved questions, MBA, MAT, CAT, IIFT, IGNOU, hotel management, SSC, SSC combined preliminary exam, sub-inspector of police, CBI, CPO, Railway Recruitment Board, Campus Recruitment Tests, answers, si, how to, best, English preparation, question papers, computer awareness, coaching, arithmetic, aptitude tricks, average, banking, course, classes, data interpretation tricks, exam tricks, English tips, English tricks, guide, general awareness, interview tips, interview questions, it officer, ibps lectures, mock test, model papers, materials, numerical ability, non verbal reasoning, number series, numerical ability shortcuts, online, online exam, online demo, exam pattern, po, quantitative aptitude short cuts, RRB, recruitment, success, success story, simplification, shortcuts, syllabus, syllogism, study materials, topper interview, tutorials, tips and tricks, tips, training, time and work, training videos, techniques If you had any of these queries -: how to find a prime number in a 3 digit number prime numbers check if prime number check if number is prime check if number is prime or not algorithm to check if number is prime or not trick to check if a number is prime how to tell if a number is prime or not prime number logic how to check if larger number is prime or composite what is composite number what is a prime number prime number definition definition of prime number prime and composite numbers how to check a number is prime or not how to test a prime number what is a composite number what is a prime number Boom..!! You have landed to the perfect place. This video will guide you as per you needed.
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46 bình luận cho “Prime and composite numbers. How to tell if larger number is prime | Team MAST

  1. +Uttam Saxena : This is exactly what I said. I guess u missed the final conclusion in the video (https://youtu.be/5liC14kBrQ4?t=8m31s). In fact I took the example of the number 25 itself to explain this confusion.

    Conclusion was "Every prime no. is in the form of either (6n – 1) or (6n + 1) except no 2 & 3, but it is not necessary that every no. that can be represented in form of either (6n – 1) or (6n + 1) is sure to be prime. But it is always true that all the prime numbers above 3 are of form (6n – 1) or (6n + 1)"

    So the purpose of this video was to "Conclude that any no. is definitely not prime", after which we could easily eliminate those options where no were definitely not prime and marking the left over option which would be prime (as we focus on MCQ based exams i.e CAT, MAT, GATE, UPSC, Bank PO or even placement exams pattern).
    Hope this answers your query and looking forward to your further queries.
    Have a nice day..!! 🙂
    Regards
    Team MAST

  2. Your method is not correct…because I found that according to your method 319 is prime number it satisfied (6n+1) condition and give natural number but…actually it's not prime because it has factor 11 other than 1 and itself…

  3. this trick does not work with the number 529
    when we do it with (6n+1) it gives us a natural number which means that 529 is a prime number but it is absolutely not. So can you please explain

  4. But all prime numbers do lie next to a number divisible by 6. So do a lot of composite numbers. A number 2 numbers away from a number divisible by 6 is even so it's composite. A number 3 away from a number divisible by 6 is divisible by 3. A number 4 or five away from a number divisible by 6 is within 2 or one of the next or last number divisible by 6. So only a number either greater by one or less by one than a number divisible by 6 can be prime.

  5. First represent the number in the form of 6p+/-(1) here "/" means "or". After that if it can be represented as 6p+1,then find the approximate square root of the number given. After having the square root,find all prime numbers less than the square root of the given number, then after that,divide the number by all of the prime numbers less than its approximate square root,if it is divisible by any of these prime numbers then its not a prime number if nt then its a prime number.(don't try to do it in your exams)👍👍👍👍👍👍👍👍

  6. For detecting prime. Find a square number nearer and check if the given number is divisible by the prime number sequencing below.
    Like 253 has to be checked.
    Then the nearer square is 256 that is square of 16. Check if the number is divisible by prime number below 16 that is 13,11,7,5,3,2.
    As 253 has a factor of (11*23), so it's not a prime.

    And this rule of yours is not valid.

  7. With due respect this method has many errors! By this method 222221 is a prime…. but it's not a prime! You should be more specific about saying anything out in the internet!

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