fix https links
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@@ -31,7 +31,7 @@ x % 3 == 2
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**Sources:**
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- [ask-math.com](http://www.ask-math.com/properties-of-square-numbers.html)
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- [johndcook.com](http://www.johndcook.com/blog/2008/11/17/fast-way-to-test-whether-a-number-is-a-square/)
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- [stackoverflow.com](http://stackoverflow.com/questions/295579/fastest-way-to-determine-if-an-integers-square-root-is-an-integer)
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- [stackoverflow.com](https://stackoverflow.com/questions/295579/fastest-way-to-determine-if-an-integers-square-root-is-an-integer)
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If none of this pre-conditions is true we have to manually test the number.
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We use the same the same [integer-squareroot](https://en.wikipedia.org/wiki/Integer_square_root) algorithm as in previous problems.
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