Alright, let's work through 61251798 times 61239351 step by step
61251798 × 61239351 = 61239351 × (61251798)
+ 61239351 × 8 what gives us 489914808
+ 61239351 × 90 producing 5511541590
+ 61239351 × 700 resulting in 42867545700
+ 61239351 × 1000 yielding 61239351000
+ 61239351 × 50000 producing 3061967550000
+ 61239351 × 200000 that results in 12247870200000
+ 61239351 × 1000000 what gives us 61239351000000
+ 61239351 × 60000000 which equals 3674361060000000

= 3751020357103098
