New Number Validators

[chinmay29hub]

What have you Changed

• I have added new validators in number validation

    isPrime: Check if a number is a prime number.
    isEven: Check if a number is even.
    isOdd: Check if a number is odd.
    isMultipleOf: Check if a number is a multiple of another number.
    isSquare: Check if a number is a perfect square.
    isCube: Check if a number is a perfect cube.

• I have added respective tests.

• I have documented the respective changes in Sphinx.

• Also fixed some files using Flake8.

Issue no.(must) - #14

Self Check(Tick After Making pull Request)

• One Change in one Pull Request
• I am following clean code and Documentation and my code is well linted with flake8.

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