A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2479500 can be evenly divided by 1 2 3 4 5 6 9 10 12 15 18 19 20 25 29 30 36 38 45 50 57 58 60 75 76 87 90 95 100 114 116 125 145 150 171 174 180 190 225 228 250 261 285 290 300 342 348 375 380 435 450 475 500 522 551 570 580 684 725 750 855 870 900 950 1,044 1,102 1,125 1,140 1,305 1,425 1,450 1,500 1,653 1,710 1,740 1,900 2,175 2,204 2,250 2,375 2,610 2,755 2,850 2,900 3,306 3,420 3,625 4,275 4,350 4,500 4,750 4,959 5,220 5,510 5,700 6,525 6,612 7,125 7,250 8,265 8,550 8,700 9,500 9,918 10,875 11,020 13,050 13,775 14,250 14,500 16,530 17,100 19,836 21,375 21,750 24,795 26,100 27,550 28,500 32,625 33,060 41,325 42,750 43,500 49,590 55,100 65,250 68,875 82,650 85,500 99,180 123,975 130,500 137,750 165,300 206,625 247,950 275,500 413,250 495,900 619,875 826,500 1,239,750 and 2,479,500, with no remainder.
Since 2,479,500 cannot be divided by just 1 and 2,479,500, it is not a prime number.