A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 924768 can be evenly divided by 1 2 3 4 6 8 9 12 13 16 18 19 24 26 32 36 38 39 48 52 57 72 76 78 96 104 114 117 144 152 156 169 171 208 228 234 247 288 304 312 338 342 416 456 468 494 507 608 624 676 684 741 912 936 988 1,014 1,248 1,352 1,368 1,482 1,521 1,824 1,872 1,976 2,028 2,223 2,704 2,736 2,964 3,042 3,211 3,744 3,952 4,056 4,446 5,408 5,472 5,928 6,084 6,422 7,904 8,112 8,892 9,633 11,856 12,168 12,844 16,224 17,784 19,266 23,712 24,336 25,688 28,899 35,568 38,532 48,672 51,376 57,798 71,136 77,064 102,752 115,596 154,128 231,192 308,256 462,384 and 924,768, with no remainder.
Since 924,768 cannot be divided by just 1 and 924,768, it is not a prime number.