Carolina County Community Cat Conference is going on at a resort exclusively reserved for Prime Members.
Some look-alike impostors, aka cats, have sneaked in. They all wear fancy name tags that reveal their character.
Toss on a Sherlock Holmes hat and catch these cunning cats, that is the imposters, by examining their name tags closely. Initially assume all are Prime Members, unless you notice a specific character in the name tag that reveals that it they are not a Prime Member, and instead are actually a cat.
Only basic knowledge of primality test is needed to catch the culprit.
1) was it a rat I saw
3) Madam I m Adam
5) Dammit I m mad
6) Step on no Pets
7) Never odd or even
8) Do geese see god
11) Race fast safe car
12) Madam in Eden I m Adam