A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 8797500 can be evenly divided by 1 2 3 4 5 6 9 10 12 15 17 18 20 23 25 30 34 36 45 46 50 51 60 68 69 75 85 90 92 100 102 115 125 138 150 153 170 180 204 207 225 230 250 255 276 300 306 340 345 375 391 414 425 450 460 500 510 575 612 625 690 750 765 782 828 850 900 1,020 1,035 1,125 1,150 1,173 1,250 1,275 1,380 1,500 1,530 1,564 1,700 1,725 1,875 1,955 2,070 2,125 2,250 2,300 2,346 2,500 2,550 2,875 3,060 3,450 3,519 3,750 3,825 3,910 4,140 4,250 4,500 4,692 5,100 5,175 5,625 5,750 5,865 6,375 6,900 7,038 7,500 7,650 7,820 8,500 8,625 9,775 10,350 10,625 11,250 11,500 11,730 12,750 14,076 14,375 15,300 17,250 17,595 19,125 19,550 20,700 21,250 22,500 23,460 25,500 25,875 28,750 29,325 31,875 34,500 35,190 38,250 39,100 42,500 43,125 48,875 51,750 57,500 58,650 63,750 70,380 76,500 86,250 87,975 95,625 97,750 103,500 117,300 127,500 129,375 146,625 172,500 175,950 191,250 195,500 244,375 258,750 293,250 351,900 382,500 439,875 488,750 517,500 586,500 733,125 879,750 977,500 1,466,250 1,759,500 2,199,375 2,932,500 4,398,750 and 8,797,500, with no remainder.
Since 8,797,500 cannot be divided by just 1 and 8,797,500, it is not a prime number.