Q: Is 640,658 a Prime Number?
A: No, 640,658 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 640658 can be evenly divided by 1 2 320,329 and 640,658, with no remainder.
Since 640,658 cannot be divided by just 1 and 640,658, it is not a prime number.