The number 997,500 can be evenly divided by 1 2 3 4 5 6 7 10 12 14 15 19 20 21 25 28 30 35 38 42 50 57 60 70 75 76 84 95 100 105 114 125 133 140 150 175 190 210 228 250 266 285 300 350 375 380 399 420 475 500 525 532 570 625 665 700 750 798 875 950 1,050 1,140 1,250 1,330 1,425 1,500 1,596 1,750 1,875 1,900 1,995 2,100 2,375 2,500 2,625 2,660 2,850 3,325 3,500 3,750 3,990 4,375 4,750 5,250 5,700 6,650 7,125 7,500 7,980 8,750 9,500 9,975 10,500 11,875 13,125 13,300 14,250 16,625 17,500 19,950 23,750 26,250 28,500 33,250 35,625 39,900 47,500 49,875 52,500 66,500 71,250 83,125 99,750 142,500 166,250 199,500 249,375 332,500 498,750 and 997,500, with no remainder.
Since 997,500 cannot be divided by just 1 and 997,500, it is a composite number.