A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3083184 can be evenly divided by 1 2 3 4 6 8 9 12 13 16 18 24 26 27 36 39 48 52 54 61 72 78 81 104 108 117 122 144 156 162 183 208 216 234 243 244 312 324 351 366 432 468 486 488 549 624 648 702 732 793 936 972 976 1,053 1,098 1,296 1,404 1,464 1,586 1,647 1,872 1,944 2,106 2,196 2,379 2,808 2,928 3,159 3,172 3,294 3,888 4,212 4,392 4,758 4,941 5,616 6,318 6,344 6,588 7,137 8,424 8,784 9,516 9,882 12,636 12,688 13,176 14,274 14,823 16,848 19,032 19,764 21,411 25,272 26,352 28,548 29,646 38,064 39,528 42,822 50,544 57,096 59,292 64,233 79,056 85,644 114,192 118,584 128,466 171,288 192,699 237,168 256,932 342,576 385,398 513,864 770,796 1,027,728 1,541,592 and 3,083,184, with no remainder.
Since 3,083,184 cannot be divided by just 1 and 3,083,184, it is not a prime number.