The number 2,303,640 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 18 20 24 27 30 36 40 45 54 60 72 79 81 90 108 120 135 158 162 180 216 237 243 270 316 324 360 395 405 474 486 540 632 648 711 729 790 810 948 972 1,080 1,185 1,215 1,422 1,458 1,580 1,620 1,896 1,944 2,133 2,370 2,430 2,844 2,916 3,160 3,240 3,555 3,645 4,266 4,740 4,860 5,688 5,832 6,399 7,110 7,290 8,532 9,480 9,720 10,665 12,798 14,220 14,580 17,064 19,197 21,330 25,596 28,440 29,160 31,995 38,394 42,660 51,192 57,591 63,990 76,788 85,320 95,985 115,182 127,980 153,576 191,970 230,364 255,960 287,955 383,940 460,728 575,910 767,880 1,151,820 and 2,303,640, with no remainder.
Since 2,303,640 cannot be divided by just 1 and 2,303,640, it is a composite number.