A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 9870696 can be evenly divided by 1 2 3 4 6 8 9 11 12 18 22 24 33 36 44 66 72 88 99 103 121 132 198 206 242 264 309 363 396 412 484 618 726 792 824 927 968 1,089 1,133 1,236 1,331 1,452 1,854 2,178 2,266 2,472 2,662 2,904 3,399 3,708 3,993 4,356 4,532 5,324 6,798 7,416 7,986 8,712 9,064 10,197 10,648 11,979 12,463 13,596 15,972 20,394 23,958 24,926 27,192 31,944 37,389 40,788 47,916 49,852 74,778 81,576 95,832 99,704 112,167 137,093 149,556 224,334 274,186 299,112 411,279 448,668 548,372 822,558 897,336 1,096,744 1,233,837 1,645,116 2,467,674 3,290,232 4,935,348 and 9,870,696, with no remainder.
Since 9,870,696 cannot be divided by just 1 and 9,870,696, it is not a prime number.