1x40 2x20 4x10 5x8
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its a factor with two pairs of the same number
A square number has an odd number of factors, but a number with an odd number of factor pairs is nothing special.
40 has four factor pairs:40 = 1 x 4040 = 2 x 2040 = 4 x 1040 = 5 x 8
80 has 5 factor pairs.
Factors come in pairs. If you know one factor, divide it into the number. The answer will be another factor.