Question

Is 54 a prime number or a composite number?

Answer 1

`54` is composite.

Explanation:

Factors of a prime number are just `1` and the number itself. For example `13`, whose factors are just `1` and `13` and none else. Composite number on the other hand may have one or more factors other than `1` and itself.

As `54` has factors `{1,2,3,6,9,18,27,54}` i.e. it has six factors `{2,3,6,9,18,27}`, other than `1` and itself i.e. `54`.

Hence, `54` is composite.