The number 4,257,360 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 72 73 80 81 90 108 120 135 144 146 162 180 216 219 240 243 270 292 324 360 365 405 432 438 486 540 584 648 657 720 729 730 810 876 972 1,080 1,095 1,168 1,215 1,296 1,314 1,458 1,460 1,620 1,752 1,944 1,971 2,160 2,190 2,430 2,628 2,916 2,920 3,240 3,285 3,504 3,645 3,888 3,942 4,380 4,860 5,256 5,832 5,840 5,913 6,480 6,570 7,290 7,884 8,760 9,720 9,855 10,512 11,664 11,826 13,140 14,580 15,768 17,520 17,739 19,440 19,710 23,652 26,280 29,160 29,565 31,536 35,478 39,420 47,304 52,560 53,217 58,320 59,130 70,956 78,840 88,695 94,608 106,434 118,260 141,912 157,680 177,390 212,868 236,520 266,085 283,824 354,780 425,736 473,040 532,170 709,560 851,472 1,064,340 1,419,120 2,128,680 and 4,257,360, with no remainder.
Since 4,257,360 cannot be divided by just 1 and 4,257,360, it is a composite number.