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How can you tell whether a square root of a whole number is rational or irrational?

How can you tell whether a square root of a whole number is rational or irrational?
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How can you tell whether a square root of a whole number is rational or irrational?

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User Lucas Godoy
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After the whole number is squared if it is still a whole number ex (sq4=2)it is rational. It is irrational if it is a decimal after it is squared ex (sq3)
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User Imaginary
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