A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5048316 can be evenly divided by 1 2 3 4 6 7 9 12 13 14 18 21 23 26 28 36 39 42 46 52 63 67 69 78 84 91 92 117 126 134 138 156 161 182 201 207 234 252 268 273 276 299 322 364 402 414 468 469 483 546 598 603 644 804 819 828 871 897 938 966 1,092 1,196 1,206 1,407 1,449 1,541 1,638 1,742 1,794 1,876 1,932 2,093 2,412 2,613 2,691 2,814 2,898 3,082 3,276 3,484 3,588 4,186 4,221 4,623 5,226 5,382 5,628 5,796 6,097 6,164 6,279 7,839 8,372 8,442 9,246 10,452 10,764 10,787 12,194 12,558 13,869 15,678 16,884 18,291 18,492 18,837 20,033 21,574 24,388 25,116 27,738 31,356 32,361 36,582 37,674 40,066 43,148 54,873 55,476 60,099 64,722 73,164 75,348 80,132 97,083 109,746 120,198 129,444 140,231 180,297 194,166 219,492 240,396 280,462 360,594 388,332 420,693 560,924 721,188 841,386 1,262,079 1,682,772 2,524,158 and 5,048,316, with no remainder.
Since 5,048,316 cannot be divided by just 1 and 5,048,316, it is not a prime number.