Q: Is 18 a Prime Number?

 A: No, 18 is not a prime number.

Why is 18 not a prime number?

A prime number is a natural number, greater than one, that can only be divided by 1 and itself.

The number 18 can be evenly divided by 1 2 3 6 9 and 18, with no remainder.

Since 18 cannot be divided by just 1 and 18, it is not a prime number.


More Examples

Number 16171920
Prime? noyesyesno
  • All positive natural numbers are either a prime number or a composite number (except the number 1, which is neither).

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