The number 1,073,520 can be evenly divided by 1 2 3 4 5 6 7 8 9 10 12 14 15 16 18 20 21 24 27 28 30 35 36 40 42 45 48 54 56 60 63 70 71 72 80 84 90 105 108 112 120 126 135 140 142 144 168 180 189 210 213 216 240 252 270 280 284 315 336 355 360 378 420 426 432 497 504 540 560 568 630 639 710 720 756 840 852 945 994 1,008 1,065 1,080 1,136 1,260 1,278 1,420 1,491 1,512 1,680 1,704 1,890 1,917 1,988 2,130 2,160 2,485 2,520 2,556 2,840 2,982 3,024 3,195 3,408 3,780 3,834 3,976 4,260 4,473 4,970 5,040 5,112 5,680 5,964 6,390 7,455 7,560 7,668 7,952 8,520 8,946 9,585 9,940 10,224 11,928 12,780 13,419 14,910 15,120 15,336 17,040 17,892 19,170 19,880 22,365 23,856 25,560 26,838 29,820 30,672 35,784 38,340 39,760 44,730 51,120 53,676 59,640 67,095 71,568 76,680 89,460 107,352 119,280 134,190 153,360 178,920 214,704 268,380 357,840 536,760 and 1,073,520, with no remainder.
Since 1,073,520 cannot be divided by just 1 and 1,073,520, it is a composite number.