Alright, let's work through 1531 times 1075 step by step
1531 × 1075 = 1075 × (1531)
+ 1075 × 1 producing 1075
+ 1075 × 30 producing 32250
+ 1075 × 500 what gives us 537500
+ 1075 × 1000 that results in 1075000

= 1645825
