A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2527350 can be evenly divided by 1 2 3 5 6 7 10 14 15 21 25 29 30 35 42 50 58 70 75 83 87 105 145 150 166 174 175 203 210 249 290 350 406 415 435 498 525 581 609 725 830 870 1,015 1,050 1,162 1,218 1,245 1,450 1,743 2,030 2,075 2,175 2,407 2,490 2,905 3,045 3,486 4,150 4,350 4,814 5,075 5,810 6,090 6,225 7,221 8,715 10,150 12,035 12,450 14,442 14,525 15,225 16,849 17,430 24,070 29,050 30,450 33,698 36,105 43,575 50,547 60,175 72,210 84,245 87,150 101,094 120,350 168,490 180,525 252,735 361,050 421,225 505,470 842,450 1,263,675 and 2,527,350, with no remainder.
Since 2,527,350 cannot be divided by just 1 and 2,527,350, it is not a prime number.