Find the prime factorization of 21
Step 1:
Check if number is divisible by 3
Here 21 is divisible by 3 and gives number 7
Step 2:
Check if number 7 is divisible by 3 –> NO
Number 7 is divisible by 7 and gives number 1
PRIME FACTORS
The number 21 = 3 * 7 are the product of prime factors.
INDIVIDUAL FACTORS
If you want to know individual factors you can write can do following manipulations
a. first 1 and 21 are definitely the factors of 21
b. we can find other factors by choosing combinations of other prime factors.
Hence the factors of 21 are
1, 3, 7, 21