A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 7225350 can be evenly divided by 1 2 3 5 6 10 11 15 22 25 29 30 33 50 55 58 66 75 87 110 145 150 151 165 174 275 290 302 319 330 435 453 550 638 725 755 825 870 906 957 1,450 1,510 1,595 1,650 1,661 1,914 2,175 2,265 3,190 3,322 3,775 4,350 4,379 4,530 4,785 4,983 7,550 7,975 8,305 8,758 9,570 9,966 11,325 13,137 15,950 16,610 21,895 22,650 23,925 24,915 26,274 41,525 43,790 47,850 48,169 49,830 65,685 83,050 96,338 109,475 124,575 131,370 144,507 218,950 240,845 249,150 289,014 328,425 481,690 656,850 722,535 1,204,225 1,445,070 2,408,450 3,612,675 and 7,225,350, with no remainder.
Since 7,225,350 cannot be divided by just 1 and 7,225,350, it is not a prime number.