Alright, let's work through 1631 times 1870 step by step
1631 × 1870 = 1870 × (1631)
+ 1870 × 1 resulting in 1870
+ 1870 × 30 yielding 56100
+ 1870 × 600 what gives us 1122000
+ 1870 × 1000 what gives us 1870000

= 3049970
