perfect squares
perfect square of 1
1
perfect square of 2
4
perfect square of 3
9
perfect square of 4
16
perfect square of 5
25
perfect square of 6
36
perfect square of 7
49
perfect square of 8
64
perfect square of 9
81
perfect square of 10
100
perfect square of 11
121
Perfect square of 12
144
perfect square of 13
169
perfect square of 14
196
perfect square of 15
225