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3 because it is the only number whose square is also there.
5 because it is the only number whose reciprocal is terminating decimal.
7 because it is the only number which can be drawn with only straight lines and without lifting the pen from the paper.
9 because it is the only perfect square.
11 because it is the only non-trivial palindrome.
13 because it is considered unlucky by almost every superstitious culture.


F***ING STUPID QUESTION.

9 because all other are prime numbers.

9... Which is not prime Number...

9 is the only not prime :)

9 is the only not prime :)

WTF IS WRONG WITH EPIC? ASKING STUPID QUESTIONS FROM STUPID IQ TESTS.

9 because rest fall in Prime Number category

3 because it is the only number that isn't 2 more than a number preceding it.