Math

Consider every whole number area from 2 square units to 30 square units. For which of these areas is there only one rectangle with whole number side lengths?

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1. When the area is represented by a prime number
e.g. area = 11
the sides can only be 1 by 11
area = 12
sides could be 1by12 or 2by6 or 3by4

so which are the prime numbers from 2 to 30?
btw, 2 is considered a prime number.

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