Scoring: Your score is equal to your Firaxis score (see below) times a multiplier. Your multiplier is based on the number of victory conditions (call it 'n') you satisfy on the turn that you first satisfy any victory condition. Your multiplier is equal to n ^ 2.

So, the multiplier is:
You satisfy 1 victory condition, then multiplier = 1
You satisfy 2 victory conditions, then multiplier = 4
You satisfy 3 victory conditions, then multiplier = 9
You satisfy 4 victory conditions, then multiplier = 16
You satisfy 5 victory conditions, then multiplier = 25
You satisfy 6 victory conditions, then multiplier = 36
You satisfy 7 victory conditions, then multiplier = 49

Just to remind you, the victory conditions are: Time, Conquest, Domination, UN Diplomatic, AP Diplomatic, Space, Culture