6897 is divisible by

Answer: Option D

Answer: Option D

Explanation:

Trick: Above equation can be solved by using following formula
$$\begin{aligned} (a^2 + b^2) = \frac{1}{2}((a+b)^2 + (a-b)^2) \end{aligned}$$

Answer: Option A

Answer: Option B

Explanation:

Trick: 587 * (1000 - 1) = 587000 - 587 = 586413

Answer: Option B

Explanation:

A prime number is a natural number greater than 1 which has no positive divisors other than 1 or itself.
So from above options 2 is that number