A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2522250 can be evenly divided by 1 2 3 5 6 9 10 15 18 19 25 30 38 45 50 57 59 75 90 95 114 118 125 150 171 177 190 225 250 285 295 342 354 375 450 475 531 570 590 750 855 885 950 1,062 1,121 1,125 1,425 1,475 1,710 1,770 2,242 2,250 2,375 2,655 2,850 2,950 3,363 4,275 4,425 4,750 5,310 5,605 6,726 7,125 7,375 8,550 8,850 10,089 11,210 13,275 14,250 14,750 16,815 20,178 21,375 22,125 26,550 28,025 33,630 42,750 44,250 50,445 56,050 66,375 84,075 100,890 132,750 140,125 168,150 252,225 280,250 420,375 504,450 840,750 1,261,125 and 2,522,250, with no remainder.
Since 2,522,250 cannot be divided by just 1 and 2,522,250, it is not a prime number.