Q: Is 421,872 a Prime Number?
A: No, 421,872 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 421872 can be evenly divided by 1 2 3 4 6 8 11 12 16 17 22 24 33 34 44 47 48 51 66 68 88 94 102 132 136 141 176 187 188 204 264 272 282 374 376 408 517 528 561 564 748 752 799 816 1,034 1,122 1,128 1,496 1,551 1,598 2,068 2,244 2,256 2,397 2,992 3,102 3,196 4,136 4,488 4,794 6,204 6,392 8,272 8,789 8,976 9,588 12,408 12,784 17,578 19,176 24,816 26,367 35,156 38,352 52,734 70,312 105,468 140,624 210,936 and 421,872, with no remainder.
Since 421,872 cannot be divided by just 1 and 421,872, it is not a prime number.