Question

Which of the following numbers are perfect squares?

11, 12, 16, 32, 36, 50, 64, 79, 81, 111, 121

Answer 1

11: Since 11 is a prime number, 

Hence, it is not a perfect square 

12: Since, 12 is ending with 2,

Hence, not a perfect square

16: Since, 16 = 4 × 4 

= (16)² 

Therefore, it is a perfect square 

32: Since, 32 is ending with 2,

Hence, not a perfect square

36: Since, 36 = 6²

Hence, it is a perfect square 

 50: Since, 50 = 5² × 2

Hence, it is a perfect square 

64: Since, 64 = 8²

Hence, it is a perfect square 

79: Since it is a prime number so it cannot be a perfect square 

81: Since, 81 = 9²

Hence, it is a perfect square

111: Since, 111 is a prime number so it cannot be a perfect square 

121: Since, 121 = 11²

Hence, it is a perfect square