Q: Is 640,409 a Prime Number?
A: No, 640,409 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 640409 can be evenly divided by 1 7 11 77 8,317 58,219 91,487 and 640,409, with no remainder.
Since 640,409 cannot be divided by just 1 and 640,409, it is not a prime number.