Added another method to check Pronic number

[TaranjeetSinghKalsi]

Added another method to check Pronic number using square root of number to find divisor. Also added test cases.

• [x] I have read CONTRIBUTING.md.
• [x] This pull request is all my own work -- I have not plagiarized it.
• [x] All filenames are in PascalCase.
• [x] All functions and variable names follow Java naming conventions.
• [x] All new algorithms have a URL in their comments that points to Wikipedia or other similar explanations.
• [x] All new code is formatted with clang-format -i --style=file path/to/your/file.java

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 70.44%. Comparing base (1577ec4) to head (c6b3a6d).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5919      +/-   ##
============================================
- Coverage     70.45%   70.44%   -0.01%     
- Complexity     4800     4802       +2     
============================================
  Files           642      642              
  Lines         17399    17403       +4     
  Branches       3347     3349       +2     
============================================
+ Hits          12258    12260       +2     
- Misses         4680     4681       +1     
- Partials        461      462       +1     

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