[Python] how do i improve the quality of this code? [closed]

so, the thing is i want to get largest prime factor of a very big number. i know this is probably correct but it has so many loops and conditional statements. i want to basically improve this but don't know how to?

n = int(input("Enter the value: "))

max = 0
i =1

def prime(i):
count = 0
for j in range(1,i+1,1):
if i % j== 0:
count+=1
if count == 2:
return 1
else:
return 0

#this while loop checks upto value n
while i < n:
if prime(i) and n % i == 0 and max < i:
max = i
else:
i +=1


print(max)


input: 600851475143

output: #i should get largest prime factor for this but not showing any output

btw this is not related to above question what do i do to write good code(i am an absolute beginner)

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