The number 1,439,100 can be evenly divided by 1 2 3 4 5 6 9 10 12 13 15 18 20 25 26 27 30 36 39 41 45 50 52 54 60 65 75 78 82 90 100 108 117 123 130 135 150 156 164 180 195 205 225 234 246 260 270 300 325 351 369 390 410 450 468 492 533 540 585 615 650 675 702 738 780 820 900 975 1,025 1,066 1,107 1,170 1,230 1,300 1,350 1,404 1,476 1,599 1,755 1,845 1,950 2,050 2,132 2,214 2,340 2,460 2,665 2,700 2,925 3,075 3,198 3,510 3,690 3,900 4,100 4,428 4,797 5,330 5,535 5,850 6,150 6,396 7,020 7,380 7,995 8,775 9,225 9,594 10,660 11,070 11,700 12,300 13,325 14,391 15,990 17,550 18,450 19,188 22,140 23,985 26,650 27,675 28,782 31,980 35,100 36,900 39,975 47,970 53,300 55,350 57,564 71,955 79,950 95,940 110,700 119,925 143,910 159,900 239,850 287,820 359,775 479,700 719,550 and 1,439,100, with no remainder.
Since 1,439,100 cannot be divided by just 1 and 1,439,100, it is a composite number.