A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4348656 can be evenly divided by 1 2 3 4 6 8 9 12 13 16 18 23 24 26 36 39 46 48 52 69 72 78 92 101 104 117 138 144 156 184 202 207 208 234 276 299 303 312 368 404 414 468 552 598 606 624 808 828 897 909 936 1,104 1,196 1,212 1,313 1,616 1,656 1,794 1,818 1,872 2,323 2,392 2,424 2,626 2,691 3,312 3,588 3,636 3,939 4,646 4,784 4,848 5,252 5,382 6,969 7,176 7,272 7,878 9,292 10,504 10,764 11,817 13,938 14,352 14,544 15,756 18,584 20,907 21,008 21,528 23,634 27,876 30,199 31,512 37,168 41,814 43,056 47,268 55,752 60,398 63,024 83,628 90,597 94,536 111,504 120,796 167,256 181,194 189,072 241,592 271,791 334,512 362,388 483,184 543,582 724,776 1,087,164 1,449,552 2,174,328 and 4,348,656, with no remainder.
Since 4,348,656 cannot be divided by just 1 and 4,348,656, it is not a prime number.