Q: Is 21,004,005 a Prime Number?

 A: No, 21,004,005 is not a prime number.

Why is 21,004,005 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 21004005 can be evenly divided by 1 3 5 11 15 33 55 165 127,297 381,891 636,485 1,400,267 1,909,455 4,200,801 7,001,335 and 21,004,005, with no remainder.

Since 21,004,005 cannot be divided by just 1 and 21,004,005, it is not a prime number.


More Examples

Number 21,004,00321,004,00421,004,00621,004,007
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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