Q: Is 645,080 a Prime Number?
A: No, 645,080 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 645080 can be evenly divided by 1 2 4 5 8 10 20 40 16,127 32,254 64,508 80,635 129,016 161,270 322,540 and 645,080, with no remainder.
Since 645,080 cannot be divided by just 1 and 645,080, it is not a prime number.