Q: Is 645,804 a Prime Number?
A: No, 645,804 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 645804 can be evenly divided by 1 2 3 4 6 9 12 18 36 17,939 35,878 53,817 71,756 107,634 161,451 215,268 322,902 and 645,804, with no remainder.
Since 645,804 cannot be divided by just 1 and 645,804, it is not a prime number.