A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 7571700 can be evenly divided by 1 2 3 4 5 6 9 10 12 15 18 20 25 30 36 45 47 50 60 75 90 94 100 141 150 179 180 188 225 235 282 300 358 423 450 470 537 564 705 716 846 895 900 940 1,074 1,175 1,410 1,611 1,692 1,790 2,115 2,148 2,350 2,685 2,820 3,222 3,525 3,580 4,230 4,475 4,700 5,370 6,444 7,050 8,055 8,413 8,460 8,950 10,575 10,740 13,425 14,100 16,110 16,826 17,900 21,150 25,239 26,850 32,220 33,652 40,275 42,065 42,300 50,478 53,700 75,717 80,550 84,130 100,956 126,195 151,434 161,100 168,260 210,325 252,390 302,868 378,585 420,650 504,780 630,975 757,170 841,300 1,261,950 1,514,340 1,892,925 2,523,900 3,785,850 and 7,571,700, with no remainder.
Since 7,571,700 cannot be divided by just 1 and 7,571,700, it is not a prime number.