Nine of them.
9 of them.
There are seven square numbers (1, 4, 9, 16, 25, 36, and 49) between 0 and 50.
These numbers between 1 and 40 have an odd number of factors: 4, 9, 16, 25, 36.
These numbers: 4, 9, 16.
90
There are 14 such numbers between 16 and 189.
If you are including 10 and 30 there are 11 even numbers. If you are not counting 10 and 30 there are 9 even numbers between 10 and 30.
9 and 16
9
4, 9, 16, 25, and 36 are the square numbers between 1 and 40.
4, 9, 16 and 25
4, 9, 16, 25
18
1, 4, 9, 16, 25, 36
10, 12, 14
92