Q: Is 21,002,421 a Prime Number?

 A: No, 21,002,421 is not a prime number.

Why is 21,002,421 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 21002421 can be evenly divided by 1 3 11 33 37 103 111 167 309 407 501 1,133 1,221 1,837 3,399 3,811 5,511 6,179 11,433 17,201 18,537 41,921 51,603 67,969 125,763 189,211 203,907 567,633 636,437 1,909,311 7,000,807 and 21,002,421, with no remainder.

Since 21,002,421 cannot be divided by just 1 and 21,002,421, it is not a prime number.


More Examples

Number 21,002,41921,002,42021,002,42221,002,423
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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