Square Root Day is a reminder that math is all around us, says Terrence Blackman, chair of the mathematics department at Medgar Evers College in the City University of New York.

A numerical pun, Square Root Day celebrates the alignment of a date into the form of the squaring of a number. For example, May 5, 2025, or 5/5/25, represents 5 x 5 = 25, with the square root of ...