A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 9201816 can be evenly divided by 1 2 3 4 6 8 9 12 13 18 24 26 27 29 36 39 52 54 58 72 78 87 104 108 113 116 117 156 174 216 226 232 234 261 312 339 348 351 377 452 468 522 678 696 702 754 783 904 936 1,017 1,044 1,131 1,356 1,404 1,469 1,508 1,566 2,034 2,088 2,262 2,712 2,808 2,938 3,016 3,051 3,132 3,277 3,393 4,068 4,407 4,524 5,876 6,102 6,264 6,554 6,786 8,136 8,814 9,048 9,831 10,179 11,752 12,204 13,108 13,221 13,572 17,628 19,662 20,358 24,408 26,216 26,442 27,144 29,493 35,256 39,324 39,663 40,716 42,601 52,884 58,986 78,648 79,326 81,432 85,202 88,479 105,768 117,972 127,803 158,652 170,404 176,958 235,944 255,606 317,304 340,808 353,916 383,409 511,212 707,832 766,818 1,022,424 1,150,227 1,533,636 2,300,454 3,067,272 4,600,908 and 9,201,816, with no remainder.
Since 9,201,816 cannot be divided by just 1 and 9,201,816, it is not a prime number.