31 is a Prime number because it is only divisible by 1 and itself.
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A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite. 31 is prime.
31 is prime.
31 is prime.
961 is not prime. 961 = 31 * 31
21 is composite number that is a multiple of 3. 31 is a prime number.
13 prime 63 composite 61 prime 31 prime Well the question should have been either, Which one of these numbers is not a composite number? Or, Which one of these numbers is not a prime number?