The number 3,045,120 can be evenly divided by 1 2 3 4 5 6 8 10 12 13 15 16 20 24 26 30 32 39 40 48 52 60 61 64 65 78 80 96 104 120 122 128 130 156 160 183 192 195 208 240 244 256 260 305 312 320 366 384 390 416 480 488 520 610 624 640 732 768 780 793 832 915 960 976 1,040 1,220 1,248 1,280 1,464 1,560 1,586 1,664 1,830 1,920 1,952 2,080 2,379 2,440 2,496 2,928 3,120 3,172 3,328 3,660 3,840 3,904 3,965 4,160 4,758 4,880 4,992 5,856 6,240 6,344 7,320 7,808 7,930 8,320 9,516 9,760 9,984 11,712 11,895 12,480 12,688 14,640 15,616 15,860 16,640 19,032 19,520 23,424 23,790 24,960 25,376 29,280 31,720 38,064 39,040 46,848 47,580 49,920 50,752 58,560 63,440 76,128 78,080 95,160 101,504 117,120 126,880 152,256 190,320 203,008 234,240 253,760 304,512 380,640 507,520 609,024 761,280 1,015,040 1,522,560 and 3,045,120, with no remainder.
Since 3,045,120 cannot be divided by just 1 and 3,045,120, it is a composite number.