Q: Is 21,001,221 a Prime Number?

 A: No, 21,001,221 is not a prime number.

Why is 21,001,221 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 21001221 can be evenly divided by 1 3 9 27 569 1,367 1,707 4,101 5,121 12,303 15,363 36,909 777,823 2,333,469 7,000,407 and 21,001,221, with no remainder.

Since 21,001,221 cannot be divided by just 1 and 21,001,221, it is not a prime number.


More Examples

Number 21,001,21921,001,22021,001,22221,001,223
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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