Alright, let's work through 1606 times 7641 step by step
1606 × 7641 = 7641 × (1606)
+ 7641 × 6 what gives us 45846
+ 7641 × 00 yielding 0
+ 7641 × 600 which equals 4584600
+ 7641 × 1000 yielding 7641000

= 12271446
