A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 9810780 can be evenly divided by 1 2 3 4 5 6 7 10 12 14 15 20 21 28 30 35 42 47 49 60 70 71 84 94 98 105 140 141 142 147 188 196 210 213 235 245 282 284 294 329 355 420 426 470 490 497 564 588 658 705 710 735 852 940 980 987 994 1,065 1,316 1,410 1,420 1,470 1,491 1,645 1,974 1,988 2,130 2,303 2,485 2,820 2,940 2,982 3,290 3,337 3,479 3,948 4,260 4,606 4,935 4,970 5,964 6,580 6,674 6,909 6,958 7,455 9,212 9,870 9,940 10,011 10,437 11,515 13,348 13,818 13,916 14,910 16,685 17,395 19,740 20,022 20,874 23,030 23,359 27,636 29,820 33,370 34,545 34,790 40,044 41,748 46,060 46,718 50,055 52,185 66,740 69,090 69,580 70,077 93,436 100,110 104,370 116,795 138,180 140,154 163,513 200,220 208,740 233,590 280,308 327,026 350,385 467,180 490,539 654,052 700,770 817,565 981,078 1,401,540 1,635,130 1,962,156 2,452,695 3,270,260 4,905,390 and 9,810,780, with no remainder.
Since 9,810,780 cannot be divided by just 1 and 9,810,780, it is not a prime number.