Q: Is 15,999 a Prime Number?
A: No, 15,999 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 15999 can be evenly divided by 1 3 5,333 and 15,999, with no remainder.
Since 15,999 cannot be divided by just 1 and 15,999, it is not a prime number.