A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5552960 can be evenly divided by 1 2 4 5 7 8 10 14 16 20 28 32 35 37 40 56 64 67 70 74 80 112 134 140 148 160 185 224 259 268 280 296 320 335 370 448 469 518 536 560 592 670 740 938 1,036 1,072 1,120 1,184 1,295 1,340 1,480 1,876 2,072 2,144 2,240 2,345 2,368 2,479 2,590 2,680 2,960 3,752 4,144 4,288 4,690 4,958 5,180 5,360 5,920 7,504 8,288 9,380 9,916 10,360 10,720 11,840 12,395 15,008 16,576 17,353 18,760 19,832 20,720 21,440 24,790 30,016 34,706 37,520 39,664 41,440 49,580 69,412 75,040 79,328 82,880 86,765 99,160 138,824 150,080 158,656 173,530 198,320 277,648 347,060 396,640 555,296 694,120 793,280 1,110,592 1,388,240 2,776,480 and 5,552,960, with no remainder.
Since 5,552,960 cannot be divided by just 1 and 5,552,960, it is not a prime number.