The number 4,254,624 can be evenly divided by 1 2 3 4 6 8 9 11 12 16 17 18 22 24 32 33 34 36 44 48 51 66 68 72 79 88 96 99 102 132 136 144 153 158 176 187 198 204 237 264 272 288 306 316 352 374 396 408 474 528 544 561 612 632 711 748 792 816 869 948 1,056 1,122 1,224 1,264 1,343 1,422 1,496 1,584 1,632 1,683 1,738 1,896 2,244 2,448 2,528 2,607 2,686 2,844 2,992 3,168 3,366 3,476 3,792 4,029 4,488 4,896 5,214 5,372 5,688 5,984 6,732 6,952 7,584 7,821 8,058 8,976 10,428 10,744 11,376 12,087 13,464 13,904 14,773 15,642 16,116 17,952 20,856 21,488 22,752 24,174 26,928 27,808 29,546 31,284 32,232 41,712 42,976 44,319 48,348 53,856 59,092 62,568 64,464 83,424 88,638 96,696 118,184 125,136 128,928 132,957 177,276 193,392 236,368 250,272 265,914 354,552 386,784 472,736 531,828 709,104 1,063,656 1,418,208 2,127,312 and 4,254,624, with no remainder.
Since 4,254,624 cannot be divided by just 1 and 4,254,624, it is a composite number.