Q: Is 421,555 a Prime Number?
A: No, 421,555 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 421555 can be evenly divided by 1 5 59 295 1,429 7,145 84,311 and 421,555, with no remainder.
Since 421,555 cannot be divided by just 1 and 421,555, it is not a prime number.