Q: Is 505,421 a Prime Number?
A: No, 505,421 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 505421 can be evenly divided by 1 7 103 701 721 4,907 72,203 and 505,421, with no remainder.
Since 505,421 cannot be divided by just 1 and 505,421, it is not a prime number.