Q: Is 521,424 a Prime Number?
A: No, 521,424 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 521424 can be evenly divided by 1 2 3 4 6 8 9 12 16 17 18 24 27 34 36 48 51 54 68 71 72 102 108 136 142 144 153 204 213 216 272 284 306 408 426 432 459 568 612 639 816 852 918 1,136 1,207 1,224 1,278 1,704 1,836 1,917 2,414 2,448 2,556 3,408 3,621 3,672 3,834 4,828 5,112 7,242 7,344 7,668 9,656 10,224 10,863 14,484 15,336 19,312 21,726 28,968 30,672 32,589 43,452 57,936 65,178 86,904 130,356 173,808 260,712 and 521,424, with no remainder.
Since 521,424 cannot be divided by just 1 and 521,424, it is not a prime number.