31 is a Prime number because it has only two factors which are itself and one.
73 is prime.
33 is a composite number as it can be divisible by 1, 3, 11, 33.
93 is composite.
63 is composite.
39 is a composite number 1 is neither prime nor composite number 31 and 41 are prime numbers.
composite :)
147 is a composite number because it has at least one positive factor other than one or itself.
31 is prime.
Composite. Its prime factors are 23 and 31.
No, it is a prime number.
31 and 61 are prime, the rest composite.
31 is a prime number