Alright, let's work through 2257 times 748 step by step
2257 × 748 = 748 × (2257)
+ 748 × 7 yielding 5236
+ 748 × 50 that equals 37400
+ 748 × 200 that is equal 149600
+ 748 × 2000 which equals 1496000

= 1688236
