Q: Is 279,999 a Prime Number?
A: No, 279,999 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 279999 can be evenly divided by 1 3 9 53 159 477 587 1,761 5,283 31,111 93,333 and 279,999, with no remainder.
Since 279,999 cannot be divided by just 1 and 279,999, it is not a prime number.