Alright, let's work through 6663 times 6503 step by step
6663 × 6503 = 6503 × (6663)
+ 6503 × 3 that equals 19509
+ 6503 × 60 giving us 390180
+ 6503 × 600 giving us 3901800
+ 6503 × 6000 producing 39018000

= 43329489
