The number 6,611,520 can be evenly divided by 1 2 3 4 5 6 8 10 12 15 16 20 24 30 32 40 48 60 64 71 80 96 97 120 142 160 192 194 213 240 284 291 320 355 388 426 480 485 568 582 710 776 852 960 970 1,065 1,136 1,164 1,420 1,455 1,552 1,704 1,940 2,130 2,272 2,328 2,840 2,910 3,104 3,408 3,880 4,260 4,544 4,656 5,680 5,820 6,208 6,816 6,887 7,760 8,520 9,312 11,360 11,640 13,632 13,774 15,520 17,040 18,624 20,661 22,720 23,280 27,548 31,040 34,080 34,435 41,322 46,560 55,096 68,160 68,870 82,644 93,120 103,305 110,192 137,740 165,288 206,610 220,384 275,480 330,576 413,220 440,768 550,960 661,152 826,440 1,101,920 1,322,304 1,652,880 2,203,840 3,305,760 and 6,611,520, with no remainder.
Since 6,611,520 cannot be divided by just 1 and 6,611,520, it is a composite number.