This number is a prime.
The longest recorded prison sentences were given in 1969 to two "confidence tricksters" in Iran: 7109 years (from Norris and Ross McWhirter's 10 Best Oddities and Fun Trivia).
7109 of the first billion primes become squares by
subtracting their prime indices from them. [Gaydos]
(There is one curio for this number that has not yet been approved by an editor.)
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