2 x 3 = 6
3 x 4 = 12
4 x 5 = 20
5 x 6 = 30
6 x 7 = 42
7 x 8 = 56
8 x 9 = 72
9 x 10 = 90
10 x 11 = 110
since rectangular numbers are of the form n(n+1) for natural numbers n > 1 That is because these form rectangles.
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4, 6, 8, 9, 19
9,18,27,36,45,54,63,72,81,90,99,108,117,126,135,144,153,162,171,180,189,198,207,216,225,234,243,252,261,270,279,288,297,306..........
No
All numbers are square numbers, for example, the square root of 2 squared is 2. If you mean perfect squares, here's a list: 1, 4, 9, 16, 25, 36, 49, 64, 81, 100
The first 5 square numbers are 1, 4, 9, 16, and 25.