Q: Is 321,645 a Prime Number?
A: No, 321,645 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 321645 can be evenly divided by 1 3 5 15 41 123 205 523 615 1,569 2,615 7,845 21,443 64,329 107,215 and 321,645, with no remainder.
Since 321,645 cannot be divided by just 1 and 321,645, it is not a prime number.