Alright, let's work through 1581 times 6520 step by step
1581 × 6520 = 6520 × (1581)
+ 6520 × 1 resulting in 6520
+ 6520 × 80 producing 521600
+ 6520 × 500 what gives us 3260000
+ 6520 × 1000 producing 6520000

= 10308120
