Q: Is 243,999 a Prime Number?
A: No, 243,999 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 243999 can be evenly divided by 1 3 7 9 21 27 63 189 1,291 3,873 9,037 11,619 27,111 34,857 81,333 and 243,999, with no remainder.
Since 243,999 cannot be divided by just 1 and 243,999, it is not a prime number.