A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5871800 can be evenly divided by 1 2 4 5 8 10 11 17 20 22 25 34 40 44 50 55 68 85 88 100 110 136 157 170 187 200 220 275 314 340 374 425 440 550 628 680 748 785 850 935 1,100 1,256 1,496 1,570 1,700 1,727 1,870 2,200 2,669 3,140 3,400 3,454 3,740 3,925 4,675 5,338 6,280 6,908 7,480 7,850 8,635 9,350 10,676 13,345 13,816 15,700 17,270 18,700 21,352 26,690 29,359 31,400 34,540 37,400 43,175 53,380 58,718 66,725 69,080 86,350 106,760 117,436 133,450 146,795 172,700 234,872 266,900 293,590 345,400 533,800 587,180 733,975 1,174,360 1,467,950 2,935,900 and 5,871,800, with no remainder.
Since 5,871,800 cannot be divided by just 1 and 5,871,800, it is not a prime number.