Q: Is 421,809 a Prime Number?
A: No, 421,809 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 421809 can be evenly divided by 1 3 140,603 and 421,809, with no remainder.
Since 421,809 cannot be divided by just 1 and 421,809, it is not a prime number.