Alright, let's work through 6561 times 1491 step by step
6561 × 1491 = 1491 × (6561)
+ 1491 × 1 that is equal 1491
+ 1491 × 60 giving us 89460
+ 1491 × 500 resulting in 745500
+ 1491 × 6000 what gives us 8946000

= 9782451
