As it is divisible by 3 and 9
Prime is only divisible by 1 and itself
like 1 2 3 5 7 11 and so on ...
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Composite
23, 37, 79 and 51 (assuming 1851 is a typo, 18 isnt a prime) if not a typo 1851 isnt a prime number anyway, it divides by 3
29 is the next prime number after 27. But 27 is not a prime! 3 x 9 = 27!
It can be. 27 is relatively prime to 28.
27 has only one prime factor: 3