Q: Is 63,999 a Prime Number?
A: No, 63,999 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 63999 can be evenly divided by 1 3 9 13 39 117 547 1,641 4,923 7,111 21,333 and 63,999, with no remainder.
Since 63,999 cannot be divided by just 1 and 63,999, it is not a prime number.