Q: Is 640,478 a Prime Number?
A: No, 640,478 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 640478 can be evenly divided by 1 2 320,239 and 640,478, with no remainder.
Since 640,478 cannot be divided by just 1 and 640,478, it is not a prime number.