Q: Is 636,491 a Prime Number?
A: No, 636,491 is 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 636491 can be evenly divided by 1 523 1,217 and 636,491, with no remainder.
Since 636,491 cannot be divided by just 1 and 636,491, it is not a prime number.