Q: Is 243,423 a Prime Number?
A: No, 243,423 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 243423 can be evenly divided by 1 3 9 17 37 43 51 111 129 153 333 387 629 731 1,591 1,887 2,193 4,773 5,661 6,579 14,319 27,047 81,141 and 243,423, with no remainder.
Since 243,423 cannot be divided by just 1 and 243,423, it is not a prime number.