Q: Is 21,001,005 a Prime Number?

 A: No, 21,001,005 is not a prime number.

Why is 21,001,005 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 21001005 can be evenly divided by 1 3 5 9 15 27 45 73 135 219 365 657 1,095 1,971 2,131 3,285 6,393 9,855 10,655 19,179 31,965 57,537 95,895 155,563 287,685 466,689 777,815 1,400,067 2,333,445 4,200,201 7,000,335 and 21,001,005, with no remainder.

Since 21,001,005 cannot be divided by just 1 and 21,001,005, it is not a prime number.


More Examples

Number 21,001,00321,001,00421,001,00621,001,007
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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