31 is prime. 32 and 33 are composite.
31 is prime.
Composite because '7' is a factor of 1519 7)1519 = 217 Divide by '7' again 7)217 = 31 Divide by '31' ( a prime Number) / 31 = 1 So 1519 is a composite of 7 x 7 x 31 or 49 x 31
63 is composite.
31 is prime.
31 is not composite.
An integer greater than 1 can be composite or prime but not both. So 31 cannot be a composite prime.
31 is prime. 32 and 33 are composite.
31 and 61 are prime, the rest composite.
31 is PRIME.
31 is prime.
4 is composite, 31 is prime.
31 and 47 are prime, the rest composite.
31, 47 and 103 are prime. The rest are composite.
21 is composite as 3 times 7 is 21 31 is prime
31 is prime.
No.