Python Program to find Prime Factors of a Number

Write a Python Program to find Prime Factors of a Number using For Loop, and While Loop with an example.

Python Program to find Prime Factors of a Number using For Loop

This python program allows the user to enter any positive integer. Next, the below code returns the prime factors of that number using the For Loop.

TIP: I suggest you refer Factors of a Number, and Prime Number articles to understand this python program logic.

 Number = int(input(" Please Enter any Number: "))

for i in range(2, Number + 1):
    if(Number % i == 0):
        isprime = 1
        for j in range(2, (i //2 + 1)):
            if(i % j == 0):
                isprime = 0
                break
            
        if (isprime == 1):
            print(" %d is a Prime Factor of a Given Number %d" %(i, Number))

Prime Factors of a Number using While Loop

This Prime Factors of a Number program is the same as the above. In this Python example, we replaced For Loop with While Loop

 Number = int(input(" Please Enter any Number: "))
i = 1

while(i <= Number):
    count = 0
    if(Number % i == 0):
        j = 1
        while(j <= i):
            if(i % j == 0):
                count = count + 1
            j = j + 1
            
        if (count == 2):
            print(" %d is a Prime Factor of a Given Number %d" %(i, Number))
    i = i + 1

The Prime Factors of a Number output.

 Please Enter any Number: 250
 2 is a Prime Factor of a Given Number 250
 5 is a Prime Factor of a Given Number 250