Alright, let's work through 3961 times 1615 step by step
3961 × 1615 = 1615 × (3961)
+ 1615 × 1 yielding 1615
+ 1615 × 60 which equals 96900
+ 1615 × 900 that equals 1453500
+ 1615 × 3000 giving us 4845000

= 6397015
