Alright, let's work through 1543 times 8408 step by step
1543 × 8408 = 8408 × (1543)
+ 8408 × 3 resulting in 25224
+ 8408 × 40 yielding 336320
+ 8408 × 500 producing 4204000
+ 8408 × 1000 producing 8408000

= 12973544
