# Numerical Aptitude Questions and Answers

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Which one of the following is not a prime number?

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### Answer & Explanation:

Answer: Option D

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

(112x5^{4})=?;

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### Answer & Explanation:

Answer: Option B

Explanation:

It is being given that (2^{32} + 1) is completely divisible by a whole number. Which of the following numbers is completely divisible by this number?

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### Answer & Explanation:

Answer: Option D

Explanation:

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

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### Answer & Explanation:

Answer: Option A

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 = ?

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### Answer & Explanation:

Answer: Option A

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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