Q: Is 81 a Prime Number?

 A: No, 81 is not a prime number.

Why is 81 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 81 can be evenly divided by 1 3 9 27 and 81, with no remainder.

Since 81 cannot be divided by just 1 and 81, it is not a prime number.


More Examples

Number 79808283
Prime? yesnonoyes
  • All positive natural numbers are either a prime number or a composite number (except the number 1, which is neither).

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