A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 6298500 can be evenly divided by 1 2 3 4 5 6 10 12 13 15 17 19 20 25 26 30 34 38 39 50 51 52 57 60 65 68 75 76 78 85 95 100 102 114 125 130 150 156 170 190 195 204 221 228 247 250 255 260 285 300 323 325 340 375 380 390 425 442 475 494 500 510 570 646 650 663 741 750 780 850 884 950 969 975 988 1,020 1,105 1,140 1,235 1,275 1,292 1,300 1,326 1,425 1,482 1,500 1,615 1,625 1,700 1,900 1,938 1,950 2,125 2,210 2,375 2,470 2,550 2,652 2,850 2,964 3,230 3,250 3,315 3,705 3,876 3,900 4,199 4,250 4,420 4,750 4,845 4,875 4,940 5,100 5,525 5,700 6,175 6,375 6,460 6,500 6,630 7,125 7,410 8,075 8,398 8,500 9,500 9,690 9,750 11,050 12,350 12,597 12,750 13,260 14,250 14,820 16,150 16,575 16,796 18,525 19,380 19,500 20,995 22,100 24,225 24,700 25,194 25,500 27,625 28,500 30,875 32,300 33,150 37,050 40,375 41,990 48,450 50,388 55,250 61,750 62,985 66,300 74,100 80,750 82,875 83,980 92,625 96,900 104,975 110,500 121,125 123,500 125,970 161,500 165,750 185,250 209,950 242,250 251,940 314,925 331,500 370,500 419,900 484,500 524,875 629,850 1,049,750 1,259,700 1,574,625 2,099,500 3,149,250 and 6,298,500, with no remainder.
Since 6,298,500 cannot be divided by just 1 and 6,298,500, it is not a prime number.