Which of the following numbers is a perfect square?
a.676
b.670
c.678
d.675

676 is a perfect square

Option A

Explanation:

We shall evaluate the above options to find perfect square number.

From option A:  676

We get=26

Option B: 670

We get=25.88

Option C is 678

We get=26.04

Option D is 675

We get=25.98

A number is said to be a perfect square, it gives a whole number and not a decimal value

From the above options we can say that 676 is a perfect square number.  

Result:

Thus 676 is the perfect square number .

(c, 0) i might be wrong so don't put full faith on my answer

the answer is 0.071

good luck! : d