The number p,q mustn't be 2 odd number or 2 even number. Because 2 was the only even prime number => p = 2. The least odd prime number is 3 => q = 3.

So their least possible value is: \(2.3=6\)

p,q are prime numbers,so \(p,q\ge2\) and \(p+q\ge4\)

=> p + q is odd => In 2 numbers p,q,there's an even number and an odd number

Assume that p is even,then p = 2 and q is odd.If q = 3,then p + q = 5 (satisfied)

So,the minimum values of p, q, pq are 2,3 and : 2.3 = 6 respectively

Hence,the answer is 6