17The prime numbers between 10 and 20 are 11, 13, 17 and 19. There is only one square number between 10 and 20: 16. Using the criteria given, the number that fits is 17.
The only square number between 20 and 30 is 25.
10 squared is 100. 20 squared is 400. 225 is between 100 and 400. Its square root will be between 10 and 20.
16 is an even number from 10 to 20, and its square roots are -4 and +4.
10 squared is 100. 20 squared is 400. 225 is between 100 and 400. Its square root will be between 10 and 20.
20
25 is a perfect square occurring between 20 and 30.
17 and 19
There are (not counting 1) three square numbers between 1 and 20.
36 is the only square number that is also a triangular number between 20 and 40.
Any number between 20 and 22.36
2,4,3,