Is This Prime?

Way more fun than it should be. Multiples of 3 are the worst, at least for me. Using the trick to check those helps a lot (sum the digits, it's div-by-3 iff the sum of digits is div-by-3).

Good job!<p>I managed to get 9 correct answers in a line by just randomly pressing &quot;y&quot; and &quot;n&quot;, I&#x27;m so proud of myself.

Well done !