Let’s start with arguably the simplest fact about this new year: 2025 is a perfect square. It’s equal to 45 × 45, meaning ...

Which is 9. So 9 is a square number. Here are some other examples of square numbers. Can you see how all these numbers can be arranged into a square? Which is 64. So 64 is a cube number.

A perfect square year is simply a year that can be written as the square of a whole number. For example: • 2025 = 45² • 1936 = 44² • 1849 = 43² The sequence of perfect square years starts ...