On a 18-hole golf course your friend gets hole in one. After the game, 5 witnesses give their clue to which of the 18 holes that your friend got hole in one in. However, only one of the 5 witnesses speaks the truth:

1) It is a not an even number

2) The number consists of two digits

3) The number only consists of straight lines

4) It is not a prime number

5) The number is not a square number

At what hole did your friend get hole in one?