Q: Is 421,788 a Prime Number?
A: No, 421,788 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 421788 can be evenly divided by 1 2 3 4 6 12 35,149 70,298 105,447 140,596 210,894 and 421,788, with no remainder.
Since 421,788 cannot be divided by just 1 and 421,788, it is not a prime number.