Q: Is 640,738 a Prime Number?
A: No, 640,738 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 640738 can be evenly divided by 1 2 7 14 45,767 91,534 320,369 and 640,738, with no remainder.
Since 640,738 cannot be divided by just 1 and 640,738, it is not a prime number.