On the Pencil Puzzle help page you would find this helpful hint...
All prime numbers are contained in a 1x rectangle. Prime numbers are 2, 3, 5, 7, 11, 13, 17 etc.
Odd numbers cannot be in a 2x rectangle (Example: 9 = 1x9 or 3x3)
SHIKAKU #2 - INTERMEDIATE LEVEL
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