All choices except $$200$$ are perfect squares since:  $$100=10^{2}$$  $$144=12^{2}$$  $$196=14^{2}$$ 
Which of the following numbers is not the square of a whole number? 
Options:
[1] $$100$$ 
[2] $$144$$ 
[3] $$196$$ 
[4] $$200$$ 