A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2404620 can be evenly divided by 1 2 3 4 5 6 9 10 12 15 18 20 27 30 36 45 54 60 61 73 90 108 122 135 146 180 183 219 244 270 292 305 365 366 438 540 549 610 657 730 732 876 915 1,095 1,098 1,220 1,314 1,460 1,647 1,830 1,971 2,190 2,196 2,628 2,745 3,285 3,294 3,660 3,942 4,380 4,453 5,490 6,570 6,588 7,884 8,235 8,906 9,855 10,980 13,140 13,359 16,470 17,812 19,710 22,265 26,718 32,940 39,420 40,077 44,530 53,436 66,795 80,154 89,060 120,231 133,590 160,308 200,385 240,462 267,180 400,770 480,924 601,155 801,540 1,202,310 and 2,404,620, with no remainder.
Since 2,404,620 cannot be divided by just 1 and 2,404,620, it is not a prime number.