The number 6,553,260 can be evenly divided by 1 2 3 4 5 6 7 9 10 12 14 15 18 20 21 28 30 35 36 42 45 49 60 63 70 84 90 98 105 126 140 147 180 196 210 245 252 294 315 420 441 490 588 630 735 743 882 980 1,260 1,470 1,486 1,764 2,205 2,229 2,940 2,972 3,715 4,410 4,458 5,201 6,687 7,430 8,820 8,916 10,402 11,145 13,374 14,860 15,603 20,804 22,290 26,005 26,748 31,206 33,435 36,407 44,580 46,809 52,010 62,412 66,870 72,814 78,015 93,618 104,020 109,221 133,740 145,628 156,030 182,035 187,236 218,442 234,045 312,060 327,663 364,070 436,884 468,090 546,105 655,326 728,140 936,180 1,092,210 1,310,652 1,638,315 2,184,420 3,276,630 and 6,553,260, with no remainder.
Since 6,553,260 cannot be divided by just 1 and 6,553,260, it is a composite number.