A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1199250 can be evenly divided by 1 2 3 5 6 9 10 13 15 18 25 26 30 39 41 45 50 65 75 78 82 90 117 123 125 130 150 195 205 225 234 246 250 325 369 375 390 410 450 533 585 615 650 738 750 975 1,025 1,066 1,125 1,170 1,230 1,599 1,625 1,845 1,950 2,050 2,250 2,665 2,925 3,075 3,198 3,250 3,690 4,797 4,875 5,125 5,330 5,850 6,150 7,995 9,225 9,594 9,750 10,250 13,325 14,625 15,375 15,990 18,450 23,985 26,650 29,250 30,750 39,975 46,125 47,970 66,625 79,950 92,250 119,925 133,250 199,875 239,850 399,750 599,625 and 1,199,250, with no remainder.
Since 1,199,250 cannot be divided by just 1 and 1,199,250, it is not a prime number.