No problem, we've got 1639 and 1637 to multiply
1639 × 1637 = 1637 × (1639)
+ 1637 × 9 that is equal 14733
+ 1637 × 30 what gives us 49110
+ 1637 × 600 that is equal 982200
+ 1637 × 1000 that is equal 1637000

= 2683043
