A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4719264 can be evenly divided by 1 2 3 4 6 8 11 12 16 22 24 32 33 41 44 48 66 82 88 96 109 123 132 164 176 218 246 264 327 328 352 436 451 492 528 654 656 872 902 984 1,056 1,199 1,308 1,312 1,353 1,744 1,804 1,968 2,398 2,616 2,706 3,488 3,597 3,608 3,936 4,469 4,796 5,232 5,412 7,194 7,216 8,938 9,592 10,464 10,824 13,407 14,388 14,432 17,876 19,184 21,648 26,814 28,776 35,752 38,368 43,296 49,159 53,628 57,552 71,504 98,318 107,256 115,104 143,008 147,477 196,636 214,512 294,954 393,272 429,024 589,908 786,544 1,179,816 1,573,088 2,359,632 and 4,719,264, with no remainder.
Since 4,719,264 cannot be divided by just 1 and 4,719,264, it is not a prime number.