Q: Is 645,630 a Prime Number?
A: No, 645,630 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 645630 can be evenly divided by 1 2 3 5 6 10 15 30 21,521 43,042 64,563 107,605 129,126 215,210 322,815 and 645,630, with no remainder.
Since 645,630 cannot be divided by just 1 and 645,630, it is not a prime number.