A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5000800 can be evenly divided by 1 2 4 5 7 8 10 14 16 19 20 25 28 32 35 38 40 47 50 56 70 76 80 94 95 100 112 133 140 152 160 175 188 190 200 224 235 266 280 304 329 350 376 380 400 470 475 532 560 608 658 665 700 752 760 800 893 940 950 1,064 1,120 1,175 1,316 1,330 1,400 1,504 1,520 1,645 1,786 1,880 1,900 2,128 2,350 2,632 2,660 2,800 3,040 3,290 3,325 3,572 3,760 3,800 4,256 4,465 4,700 5,264 5,320 5,600 6,251 6,580 6,650 7,144 7,520 7,600 8,225 8,930 9,400 10,528 10,640 12,502 13,160 13,300 14,288 15,200 16,450 17,860 18,800 21,280 22,325 25,004 26,320 26,600 28,576 31,255 32,900 35,720 37,600 44,650 50,008 52,640 53,200 62,510 65,800 71,440 89,300 100,016 106,400 125,020 131,600 142,880 156,275 178,600 200,032 250,040 263,200 312,550 357,200 500,080 625,100 714,400 1,000,160 1,250,200 2,500,400 and 5,000,800, with no remainder.
Since 5,000,800 cannot be divided by just 1 and 5,000,800, it is not a prime number.