Q: Is 421,456 a Prime Number?
A: No, 421,456 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 421456 can be evenly divided by 1 2 4 7 8 14 16 28 53 56 71 106 112 142 212 284 371 424 497 568 742 848 994 1,136 1,484 1,988 2,968 3,763 3,976 5,936 7,526 7,952 15,052 26,341 30,104 52,682 60,208 105,364 210,728 and 421,456, with no remainder.
Since 421,456 cannot be divided by just 1 and 421,456, it is not a prime number.