A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 7087600 can be evenly divided by 1 2 4 5 8 10 13 16 20 25 26 29 40 47 50 52 58 65 80 94 100 104 116 130 145 188 200 208 232 235 260 290 325 376 377 400 464 470 520 580 611 650 725 752 754 940 1,040 1,160 1,175 1,222 1,300 1,363 1,450 1,508 1,880 1,885 2,320 2,350 2,444 2,600 2,726 2,900 3,016 3,055 3,760 3,770 4,700 4,888 5,200 5,452 5,800 6,032 6,110 6,815 7,540 9,400 9,425 9,776 10,904 11,600 12,220 13,630 15,080 15,275 17,719 18,800 18,850 21,808 24,440 27,260 30,160 30,550 34,075 35,438 37,700 48,880 54,520 61,100 68,150 70,876 75,400 88,595 109,040 122,200 136,300 141,752 150,800 177,190 244,400 272,600 283,504 354,380 442,975 545,200 708,760 885,950 1,417,520 1,771,900 3,543,800 and 7,087,600, with no remainder.
Since 7,087,600 cannot be divided by just 1 and 7,087,600, it is not a prime number.