Q: Is 640,604 a Prime Number?
A: No, 640,604 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 640604 can be evenly divided by 1 2 4 19 38 76 8,429 16,858 33,716 160,151 320,302 and 640,604, with no remainder.
Since 640,604 cannot be divided by just 1 and 640,604, it is not a prime number.