Q: Is 645,745 a Prime Number?
A: No, 645,745 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 645745 can be evenly divided by 1 5 17 71 85 107 355 535 1,207 1,819 6,035 7,597 9,095 37,985 129,149 and 645,745, with no remainder.
Since 645,745 cannot be divided by just 1 and 645,745, it is not a prime number.