The number 3,105,960 can be evenly divided by 1 2 3 4 5 6 8 10 11 12 13 15 20 22 24 26 30 33 39 40 44 52 55 60 65 66 78 88 104 110 120 130 132 143 156 165 181 195 220 260 264 286 312 330 362 390 429 440 520 543 572 660 715 724 780 858 905 1,086 1,144 1,320 1,430 1,448 1,560 1,716 1,810 1,991 2,145 2,172 2,353 2,715 2,860 3,432 3,620 3,982 4,290 4,344 4,706 5,430 5,720 5,973 7,059 7,240 7,964 8,580 9,412 9,955 10,860 11,765 11,946 14,118 15,928 17,160 18,824 19,910 21,720 23,530 23,892 25,883 28,236 29,865 35,295 39,820 47,060 47,784 51,766 56,472 59,730 70,590 77,649 79,640 94,120 103,532 119,460 129,415 141,180 155,298 207,064 238,920 258,830 282,360 310,596 388,245 517,660 621,192 776,490 1,035,320 1,552,980 and 3,105,960, with no remainder.
Since 3,105,960 cannot be divided by just 1 and 3,105,960, it is a composite number.