Q: Is 21,008,209 a Prime Number?

 A: No, 21,008,209 is not a prime number.

Why is 21,008,209 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 21008209 can be evenly divided by 1 17 29 43 493 731 991 1,247 16,847 21,199 28,739 42,613 488,563 724,421 1,235,777 and 21,008,209, with no remainder.

Since 21,008,209 cannot be divided by just 1 and 21,008,209, it is not a prime number.


More Examples

Number 21,008,20721,008,20821,008,21021,008,211
Prime? nononono
  • All positive natural numbers are either a prime number or a composite number (except the number 1, which is neither).

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