Q: Is 640,831 a Prime Number?
A: No, 640,831 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 640831 can be evenly divided by 1 509 1,259 and 640,831, with no remainder.
Since 640,831 cannot be divided by just 1 and 640,831, it is not a prime number.