Kalkulative Knaves and Knights

Logic Level 3

There are 6 people on the island, each who can either be a knight or a knave. A knight tells the truth, whereas a knave tells the lie.

Person 1: The number of either knights or knaves is the multiple of another of the different kind.

Person 2: There are less knaves than knights here.

Person 3: There is an odd number of knaves.

Person 4: The number of knaves is not a perfect square.

Person 5: The product of two numbers of knights and knaves is a perfect cube.

Person 6: The product of two numbers of knights and knaves is a perfect square.

What is the least possible number of knaves there?

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