Q: Is 645,945 a Prime Number?
A: No, 645,945 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 645945 can be evenly divided by 1 3 5 15 43,063 129,189 215,315 and 645,945, with no remainder.
Since 645,945 cannot be divided by just 1 and 645,945, it is not a prime number.