The number 1,046,520 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 17 18 19 20 24 27 30 34 36 38 40 45 51 54 57 60 68 72 76 81 85 90 95 102 108 114 120 135 136 152 153 162 170 171 180 190 204 216 228 255 270 285 306 323 324 340 342 360 380 405 408 456 459 510 513 540 570 612 646 648 680 684 760 765 810 855 918 969 1,020 1,026 1,080 1,140 1,224 1,292 1,368 1,377 1,530 1,539 1,615 1,620 1,710 1,836 1,938 2,040 2,052 2,280 2,295 2,565 2,584 2,754 2,907 3,060 3,078 3,230 3,240 3,420 3,672 3,876 4,104 4,590 4,845 5,130 5,508 5,814 6,120 6,156 6,460 6,840 6,885 7,695 7,752 8,721 9,180 9,690 10,260 11,016 11,628 12,312 12,920 13,770 14,535 15,390 17,442 18,360 19,380 20,520 23,256 26,163 27,540 29,070 30,780 34,884 38,760 43,605 52,326 55,080 58,140 61,560 69,768 87,210 104,652 116,280 130,815 174,420 209,304 261,630 348,840 523,260 and 1,046,520, with no remainder.
Since 1,046,520 cannot be divided by just 1 and 1,046,520, it is a composite number.