A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3848184 can be evenly divided by 1 2 3 4 6 8 9 12 18 19 24 29 36 38 57 58 72 76 87 97 114 116 152 171 174 194 228 232 261 291 342 348 388 456 522 551 582 684 696 776 873 1,044 1,102 1,164 1,368 1,653 1,746 1,843 2,088 2,204 2,328 2,813 3,306 3,492 3,686 4,408 4,959 5,529 5,626 6,612 6,984 7,372 8,439 9,918 11,058 11,252 13,224 14,744 16,587 16,878 19,836 22,116 22,504 25,317 33,174 33,756 39,672 44,232 50,634 53,447 66,348 67,512 101,268 106,894 132,696 160,341 202,536 213,788 320,682 427,576 481,023 641,364 962,046 1,282,728 1,924,092 and 3,848,184, with no remainder.
Since 3,848,184 cannot be divided by just 1 and 3,848,184, it is not a prime number.