Q: Is 405,423 a Prime Number?
A: No, 405,423 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 405423 can be evenly divided by 1 3 9 107 321 421 963 1,263 3,789 45,047 135,141 and 405,423, with no remainder.
Since 405,423 cannot be divided by just 1 and 405,423, it is not a prime number.