Q: Is 243,645 a Prime Number?
A: No, 243,645 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 243645 can be evenly divided by 1 3 5 15 37 111 185 439 555 1,317 2,195 6,585 16,243 48,729 81,215 and 243,645, with no remainder.
Since 243,645 cannot be divided by just 1 and 243,645, it is not a prime number.