The number 1,138,500 can be evenly divided by 1 2 3 4 5 6 9 10 11 12 15 18 20 22 23 25 30 33 36 44 45 46 50 55 60 66 69 75 90 92 99 100 110 115 125 132 138 150 165 180 198 207 220 225 230 250 253 275 276 300 330 345 375 396 414 450 460 495 500 506 550 575 660 690 750 759 825 828 900 990 1,012 1,035 1,100 1,125 1,150 1,265 1,375 1,380 1,500 1,518 1,650 1,725 1,980 2,070 2,250 2,277 2,300 2,475 2,530 2,750 2,875 3,036 3,300 3,450 3,795 4,125 4,140 4,500 4,554 4,950 5,060 5,175 5,500 5,750 6,325 6,900 7,590 8,250 8,625 9,108 9,900 10,350 11,385 11,500 12,375 12,650 15,180 16,500 17,250 18,975 20,700 22,770 24,750 25,300 25,875 31,625 34,500 37,950 45,540 49,500 51,750 56,925 63,250 75,900 94,875 103,500 113,850 126,500 189,750 227,700 284,625 379,500 569,250 and 1,138,500, with no remainder.
Since 1,138,500 cannot be divided by just 1 and 1,138,500, it is a composite number.