Q: Is 421,376 a Prime Number?
A: No, 421,376 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 421376 can be evenly divided by 1 2 4 8 16 32 64 128 256 512 823 1,646 3,292 6,584 13,168 26,336 52,672 105,344 210,688 and 421,376, with no remainder.
Since 421,376 cannot be divided by just 1 and 421,376, it is not a prime number.