Q: Is 21,000,020 a Prime Number?

 A: No, 21,000,020 is not a prime number.

Why is 21,000,020 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 21000020 can be evenly divided by 1 2 4 5 10 20 31 62 124 155 310 620 33,871 67,742 135,484 169,355 338,710 677,420 1,050,001 2,100,002 4,200,004 5,250,005 10,500,010 and 21,000,020, with no remainder.

Since 21,000,020 cannot be divided by just 1 and 21,000,020, it is not a prime number.


More Examples

Number 21,000,01821,000,01921,000,02121,000,022
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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