A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 9756810 can be evenly divided by 1 2 3 5 6 7 9 10 14 15 17 18 21 30 34 35 42 45 51 63 70 85 90 102 105 119 126 153 170 210 238 255 306 315 357 510 595 630 714 765 911 1,071 1,190 1,530 1,785 1,822 2,142 2,733 3,570 4,555 5,355 5,466 6,377 8,199 9,110 10,710 12,754 13,665 15,487 16,398 19,131 27,330 30,974 31,885 38,262 40,995 46,461 57,393 63,770 77,435 81,990 92,922 95,655 108,409 114,786 139,383 154,870 191,310 216,818 232,305 278,766 286,965 325,227 464,610 542,045 573,930 650,454 696,915 975,681 1,084,090 1,393,830 1,626,135 1,951,362 3,252,270 4,878,405 and 9,756,810, with no remainder.
Since 9,756,810 cannot be divided by just 1 and 9,756,810, it is not a prime number.