A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4920240 can be evenly divided by 1 2 3 4 5 6 8 10 12 13 15 16 19 20 24 26 30 38 39 40 48 52 57 60 65 76 78 80 83 95 104 114 120 130 152 156 166 190 195 208 228 240 247 249 260 285 304 312 332 380 390 415 456 494 498 520 570 624 664 741 760 780 830 912 988 996 1,040 1,079 1,140 1,235 1,245 1,328 1,482 1,520 1,560 1,577 1,660 1,976 1,992 2,158 2,280 2,470 2,490 2,964 3,120 3,154 3,237 3,320 3,705 3,952 3,984 4,316 4,560 4,731 4,940 4,980 5,395 5,928 6,308 6,474 6,640 7,410 7,885 8,632 9,462 9,880 9,960 10,790 11,856 12,616 12,948 14,820 15,770 16,185 17,264 18,924 19,760 19,920 20,501 21,580 23,655 25,232 25,896 29,640 31,540 32,370 37,848 41,002 43,160 47,310 51,792 59,280 61,503 63,080 64,740 75,696 82,004 86,320 94,620 102,505 123,006 126,160 129,480 164,008 189,240 205,010 246,012 258,960 307,515 328,016 378,480 410,020 492,024 615,030 820,040 984,048 1,230,060 1,640,080 2,460,120 and 4,920,240, with no remainder.
Since 4,920,240 cannot be divided by just 1 and 4,920,240, it is not a prime number.