A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5479380 can be evenly divided by 1 2 3 4 5 6 9 10 12 15 18 20 27 30 36 45 54 60 73 90 108 135 139 146 180 219 270 278 292 365 417 438 540 556 657 695 730 834 876 1,095 1,251 1,314 1,390 1,460 1,668 1,971 2,085 2,190 2,502 2,628 2,780 3,285 3,753 3,942 4,170 4,380 5,004 6,255 6,570 7,506 7,884 8,340 9,855 10,147 12,510 13,140 15,012 18,765 19,710 20,294 25,020 30,441 37,530 39,420 40,588 50,735 60,882 75,060 91,323 101,470 121,764 152,205 182,646 202,940 273,969 304,410 365,292 456,615 547,938 608,820 913,230 1,095,876 1,369,845 1,826,460 2,739,690 and 5,479,380, with no remainder.
Since 5,479,380 cannot be divided by just 1 and 5,479,380, it is not a prime number.