Question

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

Answer 1

How about 81 = 3 x 3 x 3 x 3 .

Answer 2

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