I need to compute 987654321².

Let me break this down using the identity (a)² = a²:

987654321² = 987654321 × 987654321

I'll compute this by breaking it into parts. Let me use:
987654321 = 987654321

Actually, let me compute this directly by careful multiplication:

987654321
×987654321
___________

Let me use the formula (10⁹ - 12345679)² since 987654321 = 1000000000 - 12345679:

(10⁹ - 12345679)²
= 10¹⁸ - 2(10⁹)(12345679) + 12345679²

First: 12345679² = 152415567654321

Second: 2(10⁹)(12345679) = 24691358000000000

Therefore:
= 1000000000000000000
-  24691358000000000
+    152415567654321
___________________________
= 975461057789971041

The answer is **975461057789971041**.
