Q: Is 640,434 a Prime Number?
A: No, 640,434 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 640434 can be evenly divided by 1 2 3 6 106,739 213,478 320,217 and 640,434, with no remainder.
Since 640,434 cannot be divided by just 1 and 640,434, it is not a prime number.