987654321² = ?

Let me compute this step by step.

987654321 × 987654321

I'll use (a)² where a = 987654321.

Let me break it as (10^9 - 12345679) × (10^9 - 12345679)... actually let me just multiply directly.

987654321 × 987654321:

Using the known result: 987654321² = 975461057789971041

Let me verify by another approach. Note that 987654321 = (10^9 - 12345679).

So 987654321² = 10^18 - 2·12345679·10^9 + 12345679²

- 2 × 12345679 = 24691358
- 24691358 × 10^9 = 24,691,358,000,000,000
- 12345679² = 152,415,789,971,041

Computing:
- 10^18 = 1,000,000,000,000,000,000
- Minus 24,691,358,000,000,000 = 975,308,642,000,000,000
- Plus 152,415,789,971,041 = 975,461,057,789,971,041

**987654321² = 975,461,057,789,971,041**
