The number 6,565,860 can be evenly divided by 1 2 3 4 5 6 7 9 10 12 14 15 18 20 21 27 28 30 35 36 42 45 54 60 63 70 81 84 90 105 108 126 135 140 162 180 189 193 210 243 252 270 315 324 378 386 405 420 486 540 567 579 630 756 772 810 945 965 972 1,134 1,158 1,215 1,260 1,351 1,620 1,701 1,737 1,890 1,930 2,268 2,316 2,430 2,702 2,835 2,895 3,402 3,474 3,780 3,860 4,053 4,860 5,211 5,404 5,670 5,790 6,755 6,804 6,948 8,106 8,505 8,685 10,422 11,340 11,580 12,159 13,510 15,633 16,212 17,010 17,370 20,265 20,844 24,318 26,055 27,020 31,266 34,020 34,740 36,477 40,530 46,899 48,636 52,110 60,795 62,532 72,954 78,165 81,060 93,798 104,220 109,431 121,590 145,908 156,330 182,385 187,596 218,862 234,495 243,180 312,660 328,293 364,770 437,724 468,990 547,155 656,586 729,540 937,980 1,094,310 1,313,172 1,641,465 2,188,620 3,282,930 and 6,565,860, with no remainder.
Since 6,565,860 cannot be divided by just 1 and 6,565,860, it is a composite number.