No problem, we've got 1686 and 2505 to multiply
1686 × 2505 = 2505 × (1686)
+ 2505 × 6 producing 15030
+ 2505 × 80 which equals 200400
+ 2505 × 600 producing 1503000
+ 2505 × 1000 that equals 2505000

= 4223430
