Q: Is 640,646 a Prime Number?
A: No, 640,646 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 640646 can be evenly divided by 1 2 31 62 10,333 20,666 320,323 and 640,646, with no remainder.
Since 640,646 cannot be divided by just 1 and 640,646, it is not a prime number.