Q: Is 12,405 a Prime Number?
A: No, 12,405 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 12405 can be evenly divided by 1 3 5 15 827 2,481 4,135 and 12,405, with no remainder.
Since 12,405 cannot be divided by just 1 and 12,405, it is not a prime number.