This number is a composite.

Just showing those entries submitted by 'Rivera': (Click here to show all)

+ 9183*2^262112+1 is a 78908-digit prime found by Rivera and Gallot in 1997. First prime found by a solitaire prime-hunter, using Proth.exe, hit the Top Ten general Table of primes (6th place) compiled by C. Caldwell. [Rivera]

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