Q: Is 21,004,221 a Prime Number?

 A: No, 21,004,221 is not a prime number.

Why is 21,004,221 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 21004221 can be evenly divided by 1 3 7 21 23 69 161 483 43,487 130,461 304,409 913,227 1,000,201 3,000,603 7,001,407 and 21,004,221, with no remainder.

Since 21,004,221 cannot be divided by just 1 and 21,004,221, it is not a prime number.


More Examples

Number 21,004,21921,004,22021,004,22221,004,223
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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