Q: Is 21,000,021 a Prime Number?

 A: No, 21,000,021 is not a prime number.

Why is 21,000,021 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 21000021 can be evenly divided by 1 3 7 21 101 303 707 2,121 9,901 29,703 69,307 207,921 1,000,001 3,000,003 7,000,007 and 21,000,021, with no remainder.

Since 21,000,021 cannot be divided by just 1 and 21,000,021, it is not a prime number.


More Examples

Number 21,000,01921,000,02021,000,02221,000,023
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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