The sequence of perfect square years starts all the way back at 1 AD, and continues at increasingly wider intervals. As the number nnn grows larger, the gaps between successive perfect square ...

The year 2025 is a “perfect square year” because it’s the product of a number multiplied by itself – 45×45=2025, a phenomenon that hasn’t happened for decades.

Read by Robert Blythe from the BBC Radio Drama Company. Once upon a time, a long time ago, there lived a perfect shape: Mr Square. He was the squarest of them all; he lived in a perfectly square ...