Answers

2015-04-26T11:38:12+05:30
By  factorisation of 941.:
  you get 1X941    [941 is a prime number]
 So, it;s not a perfect square

By Prime Factorisation of 961:
  you get, 31X31  
So, it's a perfect square.

[edited]
1 5 1
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2015-04-26T22:53:34+05:30
The square root of 941 is 30.67.........   It is a prime number. Therefore, It's not a perfect square.
The square root of 961 is 31
31*31 = 961 And it is a prime number and also It is a perfect square
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