Let's compute \( 987654321^2 \) exactly.

First, let's write it out explicitly:

\[
987654321 \times 987654321
\]

To find the exact value, let's carry out the multiplication:

\[
987654321^2 = (987654321) \times (987654321) = 975461057789971041
\]

So, **987654321 squared is**

\[
\boxed{975461057789971041}
\]
