Listing the prime factors of given number

Soru3.py

def primer(n):
	notprime = False
	for x in range(2 , n):
		for y in range (2, x):
			if x%y == 0:
				notprime = True
				break	
		if notprime == False and n % x == 0:
			print(str(x) + " is prime and is a factor")
		notprime = False

primer(600851475143)