Q: Is 640,788 a Prime Number?
A: No, 640,788 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 640788 can be evenly divided by 1 2 3 4 6 12 67 134 201 268 402 797 804 1,594 2,391 3,188 4,782 9,564 53,399 106,798 160,197 213,596 320,394 and 640,788, with no remainder.
Since 640,788 cannot be divided by just 1 and 640,788, it is not a prime number.