The number 2,782,260 can be evenly divided by 1 2 3 4 5 6 9 10 12 13 15 18 20 26 29 30 36 39 41 45 52 58 60 65 78 82 87 90 116 117 123 130 145 156 164 174 180 195 205 234 246 260 261 290 348 369 377 390 410 435 468 492 522 533 580 585 615 738 754 780 820 870 1,044 1,066 1,131 1,170 1,189 1,230 1,305 1,476 1,508 1,599 1,740 1,845 1,885 2,132 2,262 2,340 2,378 2,460 2,610 2,665 3,198 3,393 3,567 3,690 3,770 4,524 4,756 4,797 5,220 5,330 5,655 5,945 6,396 6,786 7,134 7,380 7,540 7,995 9,594 10,660 10,701 11,310 11,890 13,572 14,268 15,457 15,990 16,965 17,835 19,188 21,402 22,620 23,780 23,985 30,914 31,980 33,930 35,670 42,804 46,371 47,970 53,505 61,828 67,860 71,340 77,285 92,742 95,940 107,010 139,113 154,570 185,484 214,020 231,855 278,226 309,140 463,710 556,452 695,565 927,420 1,391,130 and 2,782,260, with no remainder.
Since 2,782,260 cannot be divided by just 1 and 2,782,260, it is a composite number.