Q: Is 646,520 a Prime Number?
A: No, 646,520 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 646520 can be evenly divided by 1 2 4 5 7 8 10 14 20 28 35 40 56 70 140 280 2,309 4,618 9,236 11,545 16,163 18,472 23,090 32,326 46,180 64,652 80,815 92,360 129,304 161,630 323,260 and 646,520, with no remainder.
Since 646,520 cannot be divided by just 1 and 646,520, it is not a prime number.