The number 4,318,920 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 18 20 24 27 30 31 36 40 43 45 54 60 62 72 81 86 90 93 108 120 124 129 135 155 162 172 180 186 215 216 248 258 270 279 310 324 344 360 372 387 405 430 465 516 540 558 620 645 648 744 774 810 837 860 930 1,032 1,080 1,116 1,161 1,240 1,290 1,333 1,395 1,548 1,620 1,674 1,720 1,860 1,935 2,232 2,322 2,511 2,580 2,666 2,790 3,096 3,240 3,348 3,483 3,720 3,870 3,999 4,185 4,644 5,022 5,160 5,332 5,580 5,805 6,665 6,696 6,966 7,740 7,998 8,370 9,288 10,044 10,664 11,160 11,610 11,997 12,555 13,330 13,932 15,480 15,996 16,740 17,415 19,995 20,088 23,220 23,994 25,110 26,660 27,864 31,992 33,480 34,830 35,991 39,990 46,440 47,988 50,220 53,320 59,985 69,660 71,982 79,980 95,976 100,440 107,973 119,970 139,320 143,964 159,960 179,955 215,946 239,940 287,928 359,910 431,892 479,880 539,865 719,820 863,784 1,079,730 1,439,640 2,159,460 and 4,318,920, with no remainder.
Since 4,318,920 cannot be divided by just 1 and 4,318,920, it is a composite number.