The sum of squares of first 7 prime number also satisfy the Lagrange’s Four Square theorem

The sum of squares of first 7 prime number also satisfy the Lagrange’s Four Square theorem

The sum of squares of first 7 prime number also satisfy the Lagrange’s Four Square theorem which states that “Every positive integer can be expressed as the sum of four squares”. What is the number I am talking about?

(a) 666

(b) 484

(c) 1089

(d) 6178

Answer: A