No problem, we've got 1628 and 3945 to multiply
1628 × 3945 = 3945 × (1628)
+ 3945 × 8 producing 31560
+ 3945 × 20 that equals 78900
+ 3945 × 600 giving us 2367000
+ 3945 × 1000 which equals 3945000

= 6422460
