A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 848250 can be evenly divided by 1 2 3 5 6 9 10 13 15 18 25 26 29 30 39 45 50 58 65 75 78 87 90 117 125 130 145 150 174 195 225 234 250 261 290 325 375 377 390 435 450 522 585 650 725 750 754 870 975 1,125 1,131 1,170 1,305 1,450 1,625 1,885 1,950 2,175 2,250 2,262 2,610 2,925 3,250 3,393 3,625 3,770 4,350 4,875 5,655 5,850 6,525 6,786 7,250 9,425 9,750 10,875 11,310 13,050 14,625 16,965 18,850 21,750 28,275 29,250 32,625 33,930 47,125 56,550 65,250 84,825 94,250 141,375 169,650 282,750 424,125 and 848,250, with no remainder.
Since 848,250 cannot be divided by just 1 and 848,250, it is not a prime number.