The number 5,618,808 can be evenly divided by 1 2 3 4 6 8 9 12 13 18 23 24 26 27 29 36 39 46 52 54 58 69 72 78 81 87 92 104 108 116 117 138 156 162 174 184 207 216 232 234 261 276 299 312 324 348 351 377 414 468 522 552 598 621 648 667 696 702 754 783 828 897 936 1,044 1,053 1,131 1,196 1,242 1,334 1,404 1,508 1,566 1,656 1,794 1,863 2,001 2,088 2,106 2,262 2,349 2,392 2,484 2,668 2,691 2,808 3,016 3,132 3,393 3,588 3,726 4,002 4,212 4,524 4,698 4,968 5,336 5,382 6,003 6,264 6,786 7,176 7,452 8,004 8,073 8,424 8,671 9,048 9,396 10,179 10,764 12,006 13,572 14,904 16,008 16,146 17,342 18,009 18,792 20,358 21,528 24,012 24,219 26,013 27,144 30,537 32,292 34,684 36,018 40,716 48,024 48,438 52,026 54,027 61,074 64,584 69,368 72,036 78,039 81,432 96,876 104,052 108,054 122,148 144,072 156,078 193,752 208,104 216,108 234,117 244,296 312,156 432,216 468,234 624,312 702,351 936,468 1,404,702 1,872,936 2,809,404 and 5,618,808, with no remainder.
Since 5,618,808 cannot be divided by just 1 and 5,618,808, it is a composite number.