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What is the least number that has 4 odd factors that are all the same? Each factor is greater than 1 and can have only 1 itself as factors

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AL2006
How about 81 = 3 x 3 x 3 x 3 .
apologiabiology
greater than 1 and only 1 and itself as factor
factors have to be prime:2,3,5,7...
it has to be odd factors: 3,5,7
least:3
all same, 4 of them, 3*3*3*3=81

answer is 81