If the points \(A(2, 1)\), \(B(p, 1)\), \(C(5, 6)\) and \(D(2, q)\) are the vertices of a parallelogram \(ABCD\), then find the values of \(p\) and \(q\). Hence, check whether \(ABCD\) is a rectangle or not.
 
\(p = \)
 
\(q = \)
 
Check
 
\(AC\) \(=\) i
 
\(BD\) \(=\) i