The number 6,587,880 can be evenly divided by 1 2 3 4 5 6 8 10 12 13 15 20 24 26 30 39 40 41 52 60 65 78 82 103 104 120 123 130 156 164 195 205 206 246 260 309 312 328 390 410 412 492 515 520 533 615 618 780 820 824 984 1,030 1,066 1,230 1,236 1,339 1,545 1,560 1,599 1,640 2,060 2,132 2,460 2,472 2,665 2,678 3,090 3,198 4,017 4,120 4,223 4,264 4,920 5,330 5,356 6,180 6,396 6,695 7,995 8,034 8,446 10,660 10,712 12,360 12,669 12,792 13,390 15,990 16,068 16,892 20,085 21,115 21,320 25,338 26,780 31,980 32,136 33,784 40,170 42,230 50,676 53,560 54,899 63,345 63,960 80,340 84,460 101,352 109,798 126,690 160,680 164,697 168,920 219,596 253,380 274,495 329,394 439,192 506,760 548,990 658,788 823,485 1,097,980 1,317,576 1,646,970 2,195,960 3,293,940 and 6,587,880, with no remainder.
Since 6,587,880 cannot be divided by just 1 and 6,587,880, it is a composite number.