12 and 18 are not prime numbers because they are composite numbers
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No, neither 12 nor 18 are prime numbers. A Prime number is a number greater than 1 that can only be divided by 1 and itself. Both 12 and 18 can be divided by numbers other than 1 and themselves, so they are not prime.
no
That one is easy it is 18 and 12
18 and 6.
5 and 37 are prime. 12 and 18 are composite.
The greatest common factor of the numbers 12, 16 and 18 is 2.