A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 9347688 can be evenly divided by 1 2 3 4 6 7 8 9 12 14 17 18 21 24 28 34 36 42 51 56 63 68 72 84 102 119 126 136 153 168 204 238 252 306 357 408 476 504 612 714 952 1,071 1,091 1,224 1,428 2,142 2,182 2,856 3,273 4,284 4,364 6,546 7,637 8,568 8,728 9,819 13,092 15,274 18,547 19,638 22,911 26,184 30,548 37,094 39,276 45,822 55,641 61,096 68,733 74,188 78,552 91,644 111,282 129,829 137,466 148,376 166,923 183,288 222,564 259,658 274,932 333,846 389,487 445,128 519,316 549,864 667,692 778,974 1,038,632 1,168,461 1,335,384 1,557,948 2,336,922 3,115,896 4,673,844 and 9,347,688, with no remainder.
Since 9,347,688 cannot be divided by just 1 and 9,347,688, it is not a prime number.