Q: Is 20 a Prime Number?

 A: No, 20 is not a prime number.

Why is 20 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 20 can be evenly divided by 1 2 4 5 10 and 20, with no remainder.

Since 20 cannot be divided by just 1 and 20, it is not a prime number.


More Examples

Number 18192122
Prime? noyesnono
  • All positive natural numbers are either a prime number or a composite number (except the number 1, which is neither).

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