148 squared is $21904$, and rounding to the nearest hundredth still gives $21904.00$.

Would you like more details or have any further questions?

Here are 5 related questions to explore further:

1. What is $149^2$ rounded to the nearest hundredth?
2. How do you calculate the square of a decimal number?
3. What is the square root of $148^2$?
4. How can you approximate squares of large numbers mentally?
5. How is squaring related to the concept of area?

Tip: When squaring large numbers, breaking them down using algebraic identities, like $(a+b)^2$, can simplify the calculation.