Alright, let's work through 1590 times 5257 step by step
1590 × 5257 = 5257 × (1590)
+ 5257 × 0 that equals 0
+ 5257 × 90 that is equal 473130
+ 5257 × 500 which equals 2628500
+ 5257 × 1000 that is equal 5257000

= 8358630
