No problem, we've got 1661 and 4022 to multiply
1661 × 4022 = 4022 × (1661)
+ 4022 × 1 that is equal 4022
+ 4022 × 60 producing 241320
+ 4022 × 600 yielding 2413200
+ 4022 × 1000 what gives us 4022000

= 6680542
