A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2612250 can be evenly divided by 1 2 3 5 6 9 10 15 18 25 27 30 43 45 50 54 75 81 86 90 125 129 135 150 162 215 225 243 250 258 270 375 387 405 430 450 486 645 675 750 774 810 1,075 1,125 1,161 1,215 1,290 1,350 1,935 2,025 2,150 2,250 2,322 2,430 3,225 3,375 3,483 3,870 4,050 5,375 5,805 6,075 6,450 6,750 6,966 9,675 10,125 10,449 10,750 11,610 12,150 16,125 17,415 19,350 20,250 20,898 29,025 30,375 32,250 34,830 48,375 52,245 58,050 60,750 87,075 96,750 104,490 145,125 174,150 261,225 290,250 435,375 522,450 870,750 1,306,125 and 2,612,250, with no remainder.
Since 2,612,250 cannot be divided by just 1 and 2,612,250, it is not a prime number.