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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 ...
Square root days happen only a few times in a century, and the man who brought the day fame is celebrating his sixth one.
This May marks the only time a calendar has a Square Root Day in a 20-year span, with the last one being on April 4, 2016.