# Numerical Aptitude Questions and Answers

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Which one of the following is not a prime number?

A. 31
B. 61
C. 71
D. 91

Explanation: 91 is divisible by 7. So, it is not a prime number.

(112x54)=?;

A. 67000
B. 70000
C. 76500
D. 77200

Explanation:

It is being given that (232 + 1) is completely divisible by a whole number. Which of the following numbers is completely divisible by this number?

A. 216+1
B. 216-1
C. 7x223
D. 296+1

Explanation:

What least number must be added to 1056, so that the sum is completely divisible by 23 ?

A. 2
B. 3
C. 18
D. 21

Explanation: If the number 1056 is completely divisible by 23 means, remainder should come zero.

But if we divide 1056 by 23, the remainder is 2.

So if 2 is added to the 1056, we get remainder 0.

Therefore solution is 2

1397 x 1397 = ?

A. 1951609
B. 1981709
C. 18362619
D. 2031719

Explanation: 1397 x 1397 = (1397)2

= (1400 - 3)2

= (1400)2 + (3)2 - (2 x 1400 x 3)

= 1960000 + 9 - 8400

= 1960009 - 8400

= 1951609.

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