Q: Is 645,008 a Prime Number?
A: No, 645,008 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 645008 can be evenly divided by 1 2 4 7 8 13 14 16 26 28 52 56 91 104 112 182 208 364 443 728 886 1,456 1,772 3,101 3,544 5,759 6,202 7,088 11,518 12,404 23,036 24,808 40,313 46,072 49,616 80,626 92,144 161,252 322,504 and 645,008, with no remainder.
Since 645,008 cannot be divided by just 1 and 645,008, it is not a prime number.