Q: Is 243,405 a Prime Number?
A: No, 243,405 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 243405 can be evenly divided by 1 3 5 9 15 27 45 81 135 405 601 1,803 3,005 5,409 9,015 16,227 27,045 48,681 81,135 and 243,405, with no remainder.
Since 243,405 cannot be divided by just 1 and 243,405, it is not a prime number.