Q: Is 421,056 a Prime Number?
A: No, 421,056 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 421056 can be evenly divided by 1 2 3 4 6 8 9 12 16 17 18 24 32 34 36 43 48 51 64 68 72 86 96 102 129 136 144 153 172 192 204 258 272 288 306 344 387 408 516 544 576 612 688 731 774 816 1,032 1,088 1,224 1,376 1,462 1,548 1,632 2,064 2,193 2,448 2,752 2,924 3,096 3,264 4,128 4,386 4,896 5,848 6,192 6,579 8,256 8,772 9,792 11,696 12,384 13,158 17,544 23,392 24,768 26,316 35,088 46,784 52,632 70,176 105,264 140,352 210,528 and 421,056, with no remainder.
Since 421,056 cannot be divided by just 1 and 421,056, it is not a prime number.