Q: Is 645,704 a Prime Number?
A: No, 645,704 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 645704 can be evenly divided by 1 2 4 8 80,713 161,426 322,852 and 645,704, with no remainder.
Since 645,704 cannot be divided by just 1 and 645,704, it is not a prime number.