A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5540040 can be evenly divided by 1 2 3 4 5 6 8 9 10 11 12 15 18 20 22 24 30 33 36 40 44 45 55 60 66 72 88 90 99 110 120 132 165 180 198 220 264 330 360 396 440 495 660 792 990 1,320 1,399 1,980 2,798 3,960 4,197 5,596 6,995 8,394 11,192 12,591 13,990 15,389 16,788 20,985 25,182 27,980 30,778 33,576 41,970 46,167 50,364 55,960 61,556 62,955 76,945 83,940 92,334 100,728 123,112 125,910 138,501 153,890 167,880 184,668 230,835 251,820 277,002 307,780 369,336 461,670 503,640 554,004 615,560 692,505 923,340 1,108,008 1,385,010 1,846,680 2,770,020 and 5,540,040, with no remainder.
Since 5,540,040 cannot be divided by just 1 and 5,540,040, it is not a prime number.