42 is the sum of four prime number squares 22 + 22 + 32 + 52 and its square root is approximately equal to 6.48074
42 is the sum of four prime number squares 22 + 22 + 32 + 52 and its square root is approximately equal to 6.48074
The nearest previous perfect square is 36 and the nearest next perfect square is 49 .
