45 and 51 are both composite numbers. This means they both have factors other than themselves and one.
51 composite, 61 prime.
51 is composite.
51 is composite, 103 is prime.
prime
prime
It is composite.
composite
51 is a composite number 3 x 17 = 51
It is composite.
51 is a composite number but 61 is a prime number
24 and 51 are composite, 3 is prime.
51 is divisible by 3, therefor it is composite. A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1, 2, and 0. 1, 2, and 0 have a different name.