The number 1,345,500 can be evenly divided by 1 2 3 4 5 6 9 10 12 13 15 18 20 23 25 26 30 36 39 45 46 50 52 60 65 69 75 78 90 92 100 115 117 125 130 138 150 156 180 195 207 225 230 234 250 260 276 299 300 325 345 375 390 414 450 460 468 500 575 585 598 650 690 750 780 828 897 900 975 1,035 1,125 1,150 1,170 1,196 1,300 1,380 1,495 1,500 1,625 1,725 1,794 1,950 2,070 2,250 2,300 2,340 2,691 2,875 2,925 2,990 3,250 3,450 3,588 3,900 4,140 4,485 4,500 4,875 5,175 5,382 5,750 5,850 5,980 6,500 6,900 7,475 8,625 8,970 9,750 10,350 10,764 11,500 11,700 13,455 14,625 14,950 17,250 17,940 19,500 20,700 22,425 25,875 26,910 29,250 29,900 34,500 37,375 44,850 51,750 53,820 58,500 67,275 74,750 89,700 103,500 112,125 134,550 149,500 224,250 269,100 336,375 448,500 672,750 and 1,345,500, with no remainder.
Since 1,345,500 cannot be divided by just 1 and 1,345,500, it is a composite number.