If that's 1, 4, 18, 36 and 108, the answer is 108 and all of its multiples.
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Square numbers have an odd number of factors.
They ARE the same.
The set of factors includes one and the number itself. Proper factors do not include those two.
Prime numbers have two factors. Prime squares have three factors. Square numbers have an odd number of factors but that number varies.
Six factors.