A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5507880 can be evenly divided by 1 2 3 4 5 6 7 8 10 12 14 15 20 21 24 28 30 35 40 42 56 60 70 79 83 84 105 120 140 158 166 168 210 237 249 280 316 332 395 415 420 474 498 553 581 632 664 790 830 840 948 996 1,106 1,162 1,185 1,245 1,580 1,659 1,660 1,743 1,896 1,992 2,212 2,324 2,370 2,490 2,765 2,905 3,160 3,318 3,320 3,486 4,424 4,648 4,740 4,980 5,530 5,810 6,557 6,636 6,972 8,295 8,715 9,480 9,960 11,060 11,620 13,114 13,272 13,944 16,590 17,430 19,671 22,120 23,240 26,228 32,785 33,180 34,860 39,342 45,899 52,456 65,570 66,360 69,720 78,684 91,798 98,355 131,140 137,697 157,368 183,596 196,710 229,495 262,280 275,394 367,192 393,420 458,990 550,788 688,485 786,840 917,980 1,101,576 1,376,970 1,835,960 2,753,940 and 5,507,880, with no remainder.
Since 5,507,880 cannot be divided by just 1 and 5,507,880, it is not a prime number.