A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2287600 can be evenly divided by 1 2 4 5 7 8 10 14 16 19 20 25 28 35 38 40 43 50 56 70 76 80 86 95 100 112 133 140 152 172 175 190 200 215 266 280 301 304 344 350 380 400 430 475 532 560 602 665 688 700 760 817 860 950 1,064 1,075 1,204 1,330 1,400 1,505 1,520 1,634 1,720 1,900 2,128 2,150 2,408 2,660 2,800 3,010 3,268 3,325 3,440 3,800 4,085 4,300 4,816 5,320 5,719 6,020 6,536 6,650 7,525 7,600 8,170 8,600 10,640 11,438 12,040 13,072 13,300 15,050 16,340 17,200 20,425 22,876 24,080 26,600 28,595 30,100 32,680 40,850 45,752 53,200 57,190 60,200 65,360 81,700 91,504 114,380 120,400 142,975 163,400 228,760 285,950 326,800 457,520 571,900 1,143,800 and 2,287,600, with no remainder.
Since 2,287,600 cannot be divided by just 1 and 2,287,600, it is not a prime number.