<p>With all of the mental energy you guys are investing into this little way of outwitting the test, you can easily raise your math score by 50 points. While you are sitting here obsessing about the one (if there is one) prime number question on the exam, you are losing 50 other points by not studying other types of questions. You DON'T need a prime number program on your calculator. You will miss the question not because you don't know the prime numbers, but because you miss the logic of the question (as long as you know the definition of a prime number). And I'm speaking as an SAT tutor.</p>