The number 6,409,260 can be evenly divided by 1 2 3 4 5 6 9 10 11 12 13 15 18 20 22 26 27 30 33 36 39 44 45 52 54 55 60 65 66 78 83 90 99 108 110 117 130 132 135 143 156 165 166 180 195 198 220 234 249 260 270 286 297 330 332 351 390 396 415 429 468 495 498 540 572 585 594 660 702 715 747 780 830 858 913 990 996 1,079 1,170 1,188 1,245 1,287 1,404 1,430 1,485 1,494 1,660 1,716 1,755 1,826 1,980 2,145 2,158 2,241 2,340 2,490 2,574 2,739 2,860 2,970 2,988 3,237 3,510 3,652 3,735 3,861 4,290 4,316 4,482 4,565 4,980 5,148 5,395 5,478 5,940 6,435 6,474 7,020 7,470 7,722 8,217 8,580 8,964 9,130 9,711 10,790 10,956 11,205 11,869 12,870 12,948 13,695 14,940 15,444 16,185 16,434 18,260 19,305 19,422 21,580 22,410 23,738 24,651 25,740 27,390 29,133 32,370 32,868 35,607 38,610 38,844 41,085 44,820 47,476 48,555 49,302 54,780 58,266 59,345 64,740 71,214 77,220 82,170 97,110 98,604 106,821 116,532 118,690 123,255 142,428 145,665 164,340 178,035 194,220 213,642 237,380 246,510 291,330 320,463 356,070 427,284 493,020 534,105 582,660 640,926 712,140 1,068,210 1,281,852 1,602,315 2,136,420 3,204,630 and 6,409,260, with no remainder.
Since 6,409,260 cannot be divided by just 1 and 6,409,260, it is a composite number.