This site is supported by donations to The OEIS Foundation.

# Square numbers

The square numbers, or perfect squares, or just squares, are integers having an integer for a square root. For example, 144 is a square number, since $\sqrt{144} = 12$. (But 12 is not a square number, since $\sqrt{12} = 2 \sqrt{3} \approx 3.464101615$). See A000290.

4-sided polygonal numbers.

2-dimensional regular orthotopic numbers.

2-dimensional orthoplicial polytopic numbers.