The number 1,305,480 can be evenly divided by 1 2 3 4 5 6 8 10 11 12 15 20 22 23 24 30 33 40 43 44 46 55 60 66 69 86 88 92 110 115 120 129 132 138 165 172 184 215 220 230 253 258 264 276 330 344 345 430 440 460 473 506 516 552 645 660 690 759 860 920 946 989 1,012 1,032 1,265 1,290 1,320 1,380 1,419 1,518 1,720 1,892 1,978 2,024 2,365 2,530 2,580 2,760 2,838 2,967 3,036 3,784 3,795 3,956 4,730 4,945 5,060 5,160 5,676 5,934 6,072 7,095 7,590 7,912 9,460 9,890 10,120 10,879 11,352 11,868 14,190 14,835 15,180 18,920 19,780 21,758 23,736 28,380 29,670 30,360 32,637 39,560 43,516 54,395 56,760 59,340 65,274 87,032 108,790 118,680 130,548 163,185 217,580 261,096 326,370 435,160 652,740 and 1,305,480, with no remainder.
Since 1,305,480 cannot be divided by just 1 and 1,305,480, it is a composite number.