A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 9810840 can be evenly divided by 1 2 3 4 5 6 8 10 12 13 15 19 20 24 26 30 38 39 40 52 57 60 65 76 78 95 104 114 120 130 152 156 190 195 228 247 260 285 312 331 380 390 456 494 520 570 662 741 760 780 988 993 1,140 1,235 1,324 1,482 1,560 1,655 1,976 1,986 2,280 2,470 2,648 2,964 3,310 3,705 3,972 4,303 4,940 4,965 5,928 6,289 6,620 7,410 7,944 8,606 9,880 9,930 12,578 12,909 13,240 14,820 17,212 18,867 19,860 21,515 25,156 25,818 29,640 31,445 34,424 37,734 39,720 43,030 50,312 51,636 62,890 64,545 75,468 81,757 86,060 94,335 103,272 125,780 129,090 150,936 163,514 172,120 188,670 245,271 251,560 258,180 327,028 377,340 408,785 490,542 516,360 654,056 754,680 817,570 981,084 1,226,355 1,635,140 1,962,168 2,452,710 3,270,280 4,905,420 and 9,810,840, with no remainder.
Since 9,810,840 cannot be divided by just 1 and 9,810,840, it is not a prime number.