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. neither 45 nor 54 are prime.
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The prime numbers (factors) of 54 are: 2 and 3
what prime numbers have the sum of 54
54 is divisible by 2 and 3 which are prime numbers
3 is one of the prime numbers of 45.
73 is a prime number, but 45 is not a prime number.