No problem, we've got 1615 and 4060 to multiply
1615 × 4060 = 4060 × (1615)
+ 4060 × 5 that results in 20300
+ 4060 × 10 what gives us 40600
+ 4060 × 600 resulting in 2436000
+ 4060 × 1000 that equals 4060000

= 6556900
