Q: 31 prime or composite

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4 is composite, 31 is prime.

31 and 61 are prime, the rest composite.

31 and 47 are prime, the rest composite.

31 is a prime number because it has only two factors which are itself and one

31, 37, & 41 are prime; 32,33,34,35,36,38,39 & 40 are composite.

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An integer greater than 1 can be composite or prime but not both. So 31 cannot be a composite prime.

31 is prime.

31 is prime. 32 and 33 are composite.

31 is prime.

4 is composite, 31 is prime.

31 is a prime number.

31 is prime.

31 is a prime number

31 is prime.

31, 47 and 103 are prime. The rest are composite.

is 2 prime composite or square

31 and 61 are prime, the rest composite.