Alright, let's work through 1891 times 8271 step by step
1891 × 8271 = 8271 × (1891)
+ 8271 × 1 that equals 8271
+ 8271 × 90 resulting in 744390
+ 8271 × 800 yielding 6616800
+ 8271 × 1000 producing 8271000

= 15640461
