Alright, let's work through 6406 times 8503 step by step
6406 × 8503 = 8503 × (6406)
+ 8503 × 6 giving us 51018
+ 8503 × 00 that equals 0
+ 8503 × 400 yielding 3401200
+ 8503 × 6000 that equals 51018000

= 54470218
