Q: Is 645,377 a Prime Number?
A: No, 645,377 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 645377 can be evenly divided by 1 139 4,643 and 645,377, with no remainder.
Since 645,377 cannot be divided by just 1 and 645,377, it is not a prime number.