A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 9957168 can be evenly divided by 1 2 3 4 6 8 9 12 13 16 18 24 26 27 36 39 48 52 54 72 78 81 104 108 117 144 156 162 197 208 216 234 243 312 324 351 394 432 468 486 591 624 648 702 788 936 972 1,053 1,182 1,296 1,404 1,576 1,773 1,872 1,944 2,106 2,364 2,561 2,808 3,152 3,159 3,546 3,888 4,212 4,728 5,122 5,319 5,616 6,318 7,092 7,683 8,424 9,456 10,244 10,638 12,636 14,184 15,366 15,957 16,848 20,488 21,276 23,049 25,272 28,368 30,732 31,914 40,976 42,552 46,098 47,871 50,544 61,464 63,828 69,147 85,104 92,196 95,742 122,928 127,656 138,294 184,392 191,484 207,441 255,312 276,588 368,784 382,968 414,882 553,176 622,323 765,936 829,764 1,106,352 1,244,646 1,659,528 2,489,292 3,319,056 4,978,584 and 9,957,168, with no remainder.
Since 9,957,168 cannot be divided by just 1 and 9,957,168, it is not a prime number.