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There are 11 numbers between 1 and 130 that have an odd number of factors: 1,4,9,16,25,36,49,64,81,100,121.
These numbers between 1 and 40 have an odd number of factors: 4, 9, 16, 25, 36.
Square numbers have an odd number of factors.
All square numbers have an odd number of factors.
Perfect squares are numbers with an odd number of factors.