Q: Is 400,401 a Prime Number?

 A: No, 400,401 is not a prime number.

Why is 400,401 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 400401 can be evenly divided by 1 3 9 17 51 153 2,617 7,851 23,553 44,489 133,467 and 400,401, with no remainder.

Since 400,401 cannot be divided by just 1 and 400,401, it is not a prime number.


More Examples

Number 400,399400,400400,402400,403
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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