Alright, let's work through 1636 times 725 step by step
1636 × 725 = 725 × (1636)
+ 725 × 6 that equals 4350
+ 725 × 30 which equals 21750
+ 725 × 600 giving us 435000
+ 725 × 1000 what gives us 725000

= 1186100
