57. Which one of the following is a prime number ?

A.161

B.221

C.373

D.437

58. Which one of the following is a prime number ?

A.119

B.187

C.247

D.None of these

59. The smallest 3-digit prime numbers is :

A.103

B.107

C.109

D.None of these

60. If a and b are odd numbers, then which of the following is even ?

A.a + b

B.a + b + 1

C.ab

D.ab + 2

61. Which one of the following cannot be the square of a natural number ?

A.30976

B.75625

C.28561

D.143642

62. Which one of the following cannot be the square of a natural number ?

A.32761

B.81225

C.42437

D.20164

63. What smallest number should be added to 4456 so that the sum is completely divisible by 6 ?

A.4

B.3

C.2

D.1

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