Q: Is 21,013,209 a Prime Number?

 A: No, 21,013,209 is not a prime number.

Why is 21,013,209 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 21013209 can be evenly divided by 1 3 7 9 21 27 49 63 147 189 343 441 1,029 1,323 2,269 3,087 6,807 9,261 15,883 20,421 47,649 61,263 111,181 142,947 333,543 428,841 778,267 1,000,629 2,334,801 3,001,887 7,004,403 and 21,013,209, with no remainder.

Since 21,013,209 cannot be divided by just 1 and 21,013,209, it is not a prime number.


More Examples

Number 21,013,20721,013,20821,013,21021,013,211
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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