Alright, let's work through 3163 times 831 step by step
3163 × 831 = 831 × (3163)
+ 831 × 3 that is equal 2493
+ 831 × 60 that equals 49860
+ 831 × 100 which equals 83100
+ 831 × 3000 which equals 2493000

= 2628453
