A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 9239776 can be evenly divided by 1 2 4 7 8 13 14 16 19 26 28 32 38 52 56 76 91 104 112 133 152 167 182 208 224 247 266 304 334 364 416 494 532 608 668 728 988 1,064 1,169 1,336 1,456 1,729 1,976 2,128 2,171 2,338 2,672 2,912 3,173 3,458 3,952 4,256 4,342 4,676 5,344 6,346 6,916 7,904 8,684 9,352 12,692 13,832 15,197 17,368 18,704 22,211 25,384 27,664 30,394 34,736 37,408 41,249 44,422 50,768 55,328 60,788 69,472 82,498 88,844 101,536 121,576 164,996 177,688 243,152 288,743 329,992 355,376 486,304 577,486 659,984 710,752 1,154,972 1,319,968 2,309,944 4,619,888 and 9,239,776, with no remainder.
Since 9,239,776 cannot be divided by just 1 and 9,239,776, it is not a prime number.