Q: Is 640,624 a Prime Number?
A: No, 640,624 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 640624 can be evenly divided by 1 2 4 8 16 40,039 80,078 160,156 320,312 and 640,624, with no remainder.
Since 640,624 cannot be divided by just 1 and 640,624, it is not a prime number.