Q: Is 645,315 a Prime Number?
A: No, 645,315 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 645315 can be evenly divided by 1 3 5 11 15 33 55 165 3,911 11,733 19,555 43,021 58,665 129,063 215,105 and 645,315, with no remainder.
Since 645,315 cannot be divided by just 1 and 645,315, it is not a prime number.