A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5503740 can be evenly divided by 1 2 3 4 5 6 10 11 12 15 20 22 30 31 33 44 55 60 62 66 93 110 124 132 155 165 186 220 269 310 330 341 372 465 538 620 660 682 807 930 1,023 1,076 1,345 1,364 1,614 1,705 1,860 2,046 2,690 2,959 3,228 3,410 4,035 4,092 5,115 5,380 5,918 6,820 8,070 8,339 8,877 10,230 11,836 14,795 16,140 16,678 17,754 20,460 25,017 29,590 33,356 35,508 41,695 44,385 50,034 59,180 83,390 88,770 91,729 100,068 125,085 166,780 177,540 183,458 250,170 275,187 366,916 458,645 500,340 550,374 917,290 1,100,748 1,375,935 1,834,580 2,751,870 and 5,503,740, with no remainder.
Since 5,503,740 cannot be divided by just 1 and 5,503,740, it is not a prime number.