Q: Is 279,321 a Prime Number?
A: No, 279,321 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 279321 can be evenly divided by 1 3 7 21 47 141 283 329 849 987 1,981 5,943 13,301 39,903 93,107 and 279,321, with no remainder.
Since 279,321 cannot be divided by just 1 and 279,321, it is not a prime number.