Q: Is 640,629 a Prime Number?
A: No, 640,629 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 640629 can be evenly divided by 1 3 9 11 27 33 81 99 297 719 891 2,157 6,471 7,909 19,413 23,727 58,239 71,181 213,543 and 640,629, with no remainder.
Since 640,629 cannot be divided by just 1 and 640,629, it is not a prime number.