The number 8,643,888 can be evenly divided by 1 2 3 4 6 8 9 11 12 16 17 18 22 24 27 33 34 36 44 48 51 54 66 68 72 88 99 102 107 108 132 136 144 153 176 187 198 204 214 216 264 272 297 306 321 374 396 408 428 432 459 528 561 594 612 642 748 792 816 856 918 963 1,122 1,177 1,188 1,224 1,284 1,496 1,584 1,683 1,712 1,819 1,836 1,926 2,244 2,354 2,376 2,448 2,568 2,889 2,992 3,366 3,531 3,638 3,672 3,852 4,488 4,708 4,752 5,049 5,136 5,457 5,778 6,732 7,062 7,276 7,344 7,704 8,976 9,416 10,098 10,593 10,914 11,556 13,464 14,124 14,552 15,408 16,371 18,832 20,009 20,196 21,186 21,828 23,112 26,928 28,248 29,104 31,779 32,742 40,018 40,392 42,372 43,656 46,224 49,113 56,496 60,027 63,558 65,484 80,036 80,784 84,744 87,312 98,226 120,054 127,116 130,968 160,072 169,488 180,081 196,452 240,108 254,232 261,936 320,144 360,162 392,904 480,216 508,464 540,243 720,324 785,808 960,432 1,080,486 1,440,648 2,160,972 2,881,296 4,321,944 and 8,643,888, with no remainder.
Since 8,643,888 cannot be divided by just 1 and 8,643,888, it is a composite number.