A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 7225020 can be evenly divided by 1 2 3 4 5 6 9 10 11 12 15 18 20 22 30 33 36 41 44 45 55 60 66 82 89 90 99 110 123 132 164 165 178 180 198 205 220 246 267 330 356 369 396 410 445 451 492 495 534 615 660 738 801 820 890 902 979 990 1,068 1,230 1,335 1,353 1,476 1,602 1,780 1,804 1,845 1,958 1,980 2,255 2,460 2,670 2,706 2,937 3,204 3,649 3,690 3,916 4,005 4,059 4,510 4,895 5,340 5,412 5,874 6,765 7,298 7,380 8,010 8,118 8,811 9,020 9,790 10,947 11,748 13,530 14,596 14,685 16,020 16,236 17,622 18,245 19,580 20,295 21,894 27,060 29,370 32,841 35,244 36,490 40,139 40,590 43,788 44,055 54,735 58,740 65,682 72,980 80,278 81,180 88,110 109,470 120,417 131,364 160,556 164,205 176,220 200,695 218,940 240,834 328,410 361,251 401,390 481,668 602,085 656,820 722,502 802,780 1,204,170 1,445,004 1,806,255 2,408,340 3,612,510 and 7,225,020, with no remainder.
Since 7,225,020 cannot be divided by just 1 and 7,225,020, it is not a prime number.