Q: Is 21,457,721 a Composite Number?

 A: No, 21,457,721 is not a composite number; it is a prime number.

Why is 21,457,721 not a composite number?

A composite number is a number that can be divided evenly by more numbers than 1 and itself. It is the opposite of a prime number.

The number 21,457,721 can be evenly divided by 1 and 21,457,721, with no remainder.

Since 21,457,721 can be divided by just 1 and 21,457,721, it is not a composite number.


More Examples

Number 21,457,71921,457,72021,457,72221,457,723
Composite? yesyesyesyes
  • All positive natural numbers are either a prime number or a composite number (except the number 1, which is neither).

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