A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5875980 can be evenly divided by 1 2 3 4 5 6 10 11 12 15 20 22 29 30 33 44 55 58 60 66 87 110 116 132 145 165 174 220 290 307 319 330 348 435 580 614 638 660 870 921 957 1,228 1,276 1,535 1,595 1,740 1,842 1,914 3,070 3,190 3,377 3,684 3,828 4,605 4,785 6,140 6,380 6,754 8,903 9,210 9,570 10,131 13,508 16,885 17,806 18,420 19,140 20,262 26,709 33,770 35,612 40,524 44,515 50,655 53,418 67,540 89,030 97,933 101,310 106,836 133,545 178,060 195,866 202,620 267,090 293,799 391,732 489,665 534,180 587,598 979,330 1,175,196 1,468,995 1,958,660 2,937,990 and 5,875,980, with no remainder.
Since 5,875,980 cannot be divided by just 1 and 5,875,980, it is not a prime number.