Q: Is 421,863 a Prime Number?
A: No, 421,863 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 421863 can be evenly divided by 1 3 13 29 39 87 373 377 1,119 1,131 4,849 10,817 14,547 32,451 140,621 and 421,863, with no remainder.
Since 421,863 cannot be divided by just 1 and 421,863, it is not a prime number.