Yesterday's note on "A Mathematical Morsel Every Day" -- an American Mathematical Society page-a-day calendar for 2020 assembled by mathematician and writer Evelyn Lamb -- is a fact that involves the first six digits in the decimal expansion of π : 314159 is a prime number.
And, because this is a math-poetry blog, I have turned this information into a syllable-square rhyme:
3 1 4
1 5 9
is a prime!
Perhaps you'd like to explore more: Here's a link to previous blog postings with ideas by Evelyn Lamb. Rhymes often help us to remember; here is a link to postings of rhymes used to remember the digits of π. AND here is a link to some postings that feature square stanzas.