How to check that the number is prime or not?
mahima103:
first, write all numbers till 100. Then cross out 1 as it is neither prime nor composite
then cross 2 and all its multiples
circle 3 and cross all it's multiples
Do this till all no. are either circled or crossed
circled no. are prime
and crossed are composite
its called the sieve of erotosthenes
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Answers
Answered by
4
Hey friend,
A very simple answer to your question:-
If you want to check whether a number is prime or not, you should write down all the factors of the number. If it has only 2 factors i.e, 1 and the number itself, then it is a prime number.
Eg.
Factors of 13- 1, 13
So 13 is a prime number.
Factors of 12- 1, 2, 3, 4, 6, 12.
So 12 is not a prime number.
Hope this helps you... : )
A very simple answer to your question:-
If you want to check whether a number is prime or not, you should write down all the factors of the number. If it has only 2 factors i.e, 1 and the number itself, then it is a prime number.
Eg.
Factors of 13- 1, 13
So 13 is a prime number.
Factors of 12- 1, 2, 3, 4, 6, 12.
So 12 is not a prime number.
Hope this helps you... : )
we can use the sieve of erotosthenes also
to check that the number is prime or not its very simple , prime number is that which can't be divisible by any other number without itself or 1 like 2,3,5,7,11,13..and ao on
there are many methods but i prefer the sieve of erotosthenes
Thank you!
Your most welcome!!
Answered by
1
A number is greater than 1 is called a prime number, if it has only two factors, namely 1 and the number itself. Step 1: Find a whole number nearly greater than the square root of A. K ¿ square root(A) Step 2: Test whether A is divisible by any prime numberless than K. If yes A is not a prime numbe
Thanks Aarohimetha1,That is the correct answer as I also checked it on net! That is braniest answer
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I am sorry dear I already marked the other one as the brainliest
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Same here!!
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