Question

1764 as a product of its prime numbers

Answer 1

1764 
sum of digits = 1 + 7 + 6 + 4 = 18 divisible by 3 and 9 
first divide by 9 
1764 = 9 × 196 
196 , last 2 digits divisible by 4 
196 = 4 × 49 
so .1764 = 9 × 4 × 49 
then convert it in to prime factors 
1764 = 3 × 3 × 2 × 2 × 7 × 7 
= 2^2 × 3^2 × 7^2