which of the following is not a perfect square?
(A) 100856
(B) 325137
(C) 945729
(D) All of these

• B)325137 alone
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• b) 325137
  Becaz A perfect square never ends with 7
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• ans is D) All of these
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• D. All of these.
  
  At first, no perfect square ever ends with '7'. so option B is eliminated. Now how to find about the rest of the options ?
  well, every perfect square will have exactly even number of all of its factors.
  Statement 1: 100856
  You can only factor it by 2 three times. This is not an even amount of 2s so it cannot be a perfect square.
  Statement 3: 945729
  You can factor 3 three times. This is not an even amount of 3s so it cannot be a perfect square
  
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