This challenge needs to a) specify upper bound of inputs, or b) account for inaccuracies of some calculations, especially for precision errors which slip in when using math.sqrt. Currently, reference solution returns invalid results for large numbers which are not perfect squares, like test.assert_equals(isWhole(10**20 + 1), False)

This challenge suffers from a couple of issues common for new kata of new authors, like lack of random tests or informative failure messages. Remember that you can use a bunch of available resources to make sure your kata meets current Codewars quality guidelines:

• Codewars Authoring Guidelines
• #help-author and #kata-ideas channels on Codewars Discord
• Authoring examples
• Python Authoring Guide
• Codewars Testing Framework for Python

Some very similar challenges:

• https://www.codewars.com/kata/57f6ad55cca6e045d2000627
• https://www.codewars.com/kata/56853c44b295170b73000007