Alright, let's work through 1971 times 5877 step by step
1971 × 5877 = 5877 × (1971)
+ 5877 × 1 that equals 5877
+ 5877 × 70 producing 411390
+ 5877 × 900 yielding 5289300
+ 5877 × 1000 producing 5877000

= 11583567
