Q: Is 421,216 a Prime Number?
A: No, 421,216 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 421216 can be evenly divided by 1 2 4 8 16 32 13,163 26,326 52,652 105,304 210,608 and 421,216, with no remainder.
Since 421,216 cannot be divided by just 1 and 421,216, it is not a prime number.