Q: Is 13,815 a Prime Number?
A: No, 13,815 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 13815 can be evenly divided by 1 3 5 9 15 45 307 921 1,535 2,763 4,605 and 13,815, with no remainder.
Since 13,815 cannot be divided by just 1 and 13,815, it is not a prime number.