Q: Is 243,321 a Prime Number?
A: No, 243,321 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 243321 can be evenly divided by 1 3 13 17 39 51 221 367 663 1,101 4,771 6,239 14,313 18,717 81,107 and 243,321, with no remainder.
Since 243,321 cannot be divided by just 1 and 243,321, it is not a prime number.