Q: Is 421,856 a Prime Number?
A: No, 421,856 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 421856 can be evenly divided by 1 2 4 8 16 32 13,183 26,366 52,732 105,464 210,928 and 421,856, with no remainder.
Since 421,856 cannot be divided by just 1 and 421,856, it is not a prime number.