Q: Is 421,305 a Prime Number?
A: No, 421,305 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 421305 can be evenly divided by 1 3 5 15 28,087 84,261 140,435 and 421,305, with no remainder.
Since 421,305 cannot be divided by just 1 and 421,305, it is not a prime number.