A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5500880 can be evenly divided by 1 2 4 5 7 8 10 11 14 16 19 20 22 28 35 38 40 44 47 55 56 70 76 77 80 88 94 95 110 112 133 140 152 154 176 188 190 209 220 235 266 280 304 308 329 376 380 385 418 440 470 517 532 560 616 658 665 752 760 770 836 880 893 940 1,034 1,045 1,064 1,232 1,316 1,330 1,463 1,520 1,540 1,645 1,672 1,786 1,880 2,068 2,090 2,128 2,585 2,632 2,660 2,926 3,080 3,290 3,344 3,572 3,619 3,760 4,136 4,180 4,465 5,170 5,264 5,320 5,852 6,160 6,251 6,580 7,144 7,238 7,315 8,272 8,360 8,930 9,823 10,340 10,640 11,704 12,502 13,160 14,288 14,476 14,630 16,720 17,860 18,095 19,646 20,680 23,408 25,004 26,320 28,952 29,260 31,255 35,720 36,190 39,292 41,360 49,115 50,008 57,904 58,520 62,510 68,761 71,440 72,380 78,584 98,230 100,016 117,040 125,020 137,522 144,760 157,168 196,460 250,040 275,044 289,520 343,805 392,920 500,080 550,088 687,610 785,840 1,100,176 1,375,220 2,750,440 and 5,500,880, with no remainder.
Since 5,500,880 cannot be divided by just 1 and 5,500,880, it is not a prime number.