A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5488920 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 18 20 24 30 36 40 45 60 72 79 90 120 158 180 193 237 316 360 386 395 474 579 632 711 772 790 948 965 1,158 1,185 1,422 1,544 1,580 1,737 1,896 1,930 2,316 2,370 2,844 2,895 3,160 3,474 3,555 3,860 4,632 4,740 5,688 5,790 6,948 7,110 7,720 8,685 9,480 11,580 13,896 14,220 15,247 17,370 23,160 28,440 30,494 34,740 45,741 60,988 69,480 76,235 91,482 121,976 137,223 152,470 182,964 228,705 274,446 304,940 365,928 457,410 548,892 609,880 686,115 914,820 1,097,784 1,372,230 1,829,640 2,744,460 and 5,488,920, with no remainder.
Since 5,488,920 cannot be divided by just 1 and 5,488,920, it is not a prime number.