The number 2,582,580 can be evenly divided by 1 2 3 4 5 6 7 10 11 12 13 14 15 20 21 22 26 28 30 33 35 39 42 43 44 52 55 60 65 66 70 77 78 84 86 91 105 110 129 130 132 140 143 154 156 165 172 182 195 210 215 220 231 258 260 273 286 301 308 330 364 385 390 420 429 430 455 462 473 516 546 559 572 602 645 660 715 770 780 858 860 903 910 924 946 1,001 1,092 1,118 1,155 1,204 1,290 1,365 1,419 1,430 1,505 1,540 1,677 1,716 1,806 1,820 1,892 2,002 2,145 2,236 2,310 2,365 2,580 2,730 2,795 2,838 2,860 3,003 3,010 3,311 3,354 3,612 3,913 4,004 4,290 4,515 4,620 4,730 5,005 5,460 5,590 5,676 6,006 6,020 6,149 6,622 6,708 7,095 7,826 8,385 8,580 9,030 9,460 9,933 10,010 11,180 11,739 12,012 12,298 13,244 14,190 15,015 15,652 16,555 16,770 18,060 18,447 19,565 19,866 20,020 23,478 24,596 28,380 30,030 30,745 33,110 33,540 36,894 39,130 39,732 43,043 46,956 49,665 58,695 60,060 61,490 66,220 73,788 78,260 86,086 92,235 99,330 117,390 122,980 129,129 172,172 184,470 198,660 215,215 234,780 258,258 368,940 430,430 516,516 645,645 860,860 1,291,290 and 2,582,580, with no remainder.
Since 2,582,580 cannot be divided by just 1 and 2,582,580, it is a composite number.