The number 1,023,360 can be evenly divided by 1 2 3 4 5 6 8 10 12 13 15 16 20 24 26 30 32 39 40 41 48 52 60 64 65 78 80 82 96 104 120 123 128 130 156 160 164 192 195 205 208 240 246 260 312 320 328 384 390 410 416 480 492 520 533 615 624 640 656 780 820 832 960 984 1,040 1,066 1,230 1,248 1,312 1,560 1,599 1,640 1,664 1,920 1,968 2,080 2,132 2,460 2,496 2,624 2,665 3,120 3,198 3,280 3,936 4,160 4,264 4,920 4,992 5,248 5,330 6,240 6,396 6,560 7,872 7,995 8,320 8,528 9,840 10,660 12,480 12,792 13,120 15,744 15,990 17,056 19,680 21,320 24,960 25,584 26,240 31,980 34,112 39,360 42,640 51,168 63,960 68,224 78,720 85,280 102,336 127,920 170,560 204,672 255,840 341,120 511,680 and 1,023,360, with no remainder.
Since 1,023,360 cannot be divided by just 1 and 1,023,360, it is a composite number.