Sum of Reciprocals of Powers as Euler Product/Corollary 2/Examples/Zeta^2(2) over Zeta(4)

Example of Use of Sum of Reciprocals of Powers as Euler Product/Corollary 2

 * $\ds \prod_{\text {$p$ prime} } \paren {\frac {1 + p^{-2} } {1 - p^{-2} } } = \dfrac 5 2$

where the infinite product runs over the prime numbers.