What is the least number that is the product of two different primes that are squared?

The least number that is the product of two different primes that are squared is 6. This is because 6 is the product of 2 (which is squared as 2^2) and 3 (which is squared as 3^2), both of which are prime numbers. Any smaller number would not be the product of two different primes that are squared.