The number 3,907,440 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 16 18 20 24 27 30 36 40 45 48 54 60 67 72 80 81 90 108 120 134 135 144 162 180 201 216 240 243 268 270 324 335 360 402 405 432 486 536 540 603 648 670 720 729 804 810 972 1,005 1,072 1,080 1,206 1,215 1,296 1,340 1,458 1,608 1,620 1,809 1,944 2,010 2,160 2,412 2,430 2,680 2,916 3,015 3,216 3,240 3,618 3,645 3,888 4,020 4,824 4,860 5,360 5,427 5,832 6,030 6,480 7,236 7,290 8,040 9,045 9,648 9,720 10,854 11,664 12,060 14,472 14,580 16,080 16,281 18,090 19,440 21,708 24,120 27,135 28,944 29,160 32,562 36,180 43,416 48,240 48,843 54,270 58,320 65,124 72,360 81,405 86,832 97,686 108,540 130,248 144,720 162,810 195,372 217,080 244,215 260,496 325,620 390,744 434,160 488,430 651,240 781,488 976,860 1,302,480 1,953,720 and 3,907,440, with no remainder.
Since 3,907,440 cannot be divided by just 1 and 3,907,440, it is a composite number.