252 can be expressed as a product of primes as:

To express 252 as a product of primes, you need to perform prime factorization. Here are the steps:

1. Start by finding the smallest prime number that can divide 252, which is 2. So, 252 divided by 2 is 126.
2. Repeat the process with 126. The smallest prime number that can divide 126 is 2. So, 126 divided by 2 is 63.
3. Repeat the process with 63. The smallest prime number that can divide 63 is 3. So, 63 divided by 3 is 21.
4. Repeat the process with 21. The smallest prime number that can divide 21 is 3. So, 21 divided by 3 is 7.
5. Now, 7 is a prime number itself, so the process stops here.

Therefore, 252 can be expressed as a product of primes as: 2 * 2 * 3 * 3 * 7.