A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 881400 can be evenly divided by 1 2 3 4 5 6 8 10 12 13 15 20 24 25 26 30 39 40 50 52 60 65 75 78 100 104 113 120 130 150 156 195 200 226 260 300 312 325 339 390 452 520 565 600 650 678 780 904 975 1,130 1,300 1,356 1,469 1,560 1,695 1,950 2,260 2,600 2,712 2,825 2,938 3,390 3,900 4,407 4,520 5,650 5,876 6,780 7,345 7,800 8,475 8,814 11,300 11,752 13,560 14,690 16,950 17,628 22,035 22,600 29,380 33,900 35,256 36,725 44,070 58,760 67,800 73,450 88,140 110,175 146,900 176,280 220,350 293,800 440,700 and 881,400, with no remainder.
Since 881,400 cannot be divided by just 1 and 881,400, it is not a prime number.