Take 9. What equals itself and multiplies to 9? That's 3. It's big news, as it happens not so often, increasingly not so towards the end of a century. I mean, it's not a yearly like Pi Day or Mole Day. 4/4/16 sound good?
Past Square Root Days in recent history
(09/09/81)
01/01/01
02/02/04
03/03/09
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