A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5314656 can be evenly divided by 1 2 3 4 6 8 12 16 23 24 29 32 46 48 58 69 83 87 92 96 116 138 166 174 184 232 249 276 332 348 368 464 498 552 664 667 696 736 928 996 1,104 1,328 1,334 1,392 1,909 1,992 2,001 2,208 2,407 2,656 2,668 2,784 3,818 3,984 4,002 4,814 5,336 5,727 7,221 7,636 7,968 8,004 9,628 10,672 11,454 14,442 15,272 16,008 19,256 21,344 22,908 28,884 30,544 32,016 38,512 45,816 55,361 57,768 61,088 64,032 77,024 91,632 110,722 115,536 166,083 183,264 221,444 231,072 332,166 442,888 664,332 885,776 1,328,664 1,771,552 2,657,328 and 5,314,656, with no remainder.
Since 5,314,656 cannot be divided by just 1 and 5,314,656, it is not a prime number.