A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 9711660 can be evenly divided by 1 2 3 4 5 6 7 10 12 14 15 19 20 21 28 30 35 38 42 57 60 70 76 84 95 105 114 133 140 190 210 228 266 285 380 399 420 532 570 665 798 1,140 1,217 1,330 1,596 1,995 2,434 2,660 3,651 3,990 4,868 6,085 7,302 7,980 8,519 12,170 14,604 17,038 18,255 23,123 24,340 25,557 34,076 36,510 42,595 46,246 51,114 69,369 73,020 85,190 92,492 102,228 115,615 127,785 138,738 161,861 170,380 231,230 255,570 277,476 323,722 346,845 462,460 485,583 511,140 647,444 693,690 809,305 971,166 1,387,380 1,618,610 1,942,332 2,427,915 3,237,220 4,855,830 and 9,711,660, with no remainder.
Since 9,711,660 cannot be divided by just 1 and 9,711,660, it is not a prime number.