prime numbers generator is generating non prime numbers?

[ixaM]

Hey guys. I wanted to create a prime numbers generator. This is how the program looks at the moment:

from decimal import *
PRIMES = [2]
p = 3
n = 2 
x = int(input("Until which number do you want to know the primes?"))
while True:
    if p/n == int(p/n) and p/n != 1.0:
        p = p+1
    if p/n != int(p/n):
        n = n+1
    if p/n == 1:
        PRIMES.append(p)
        p = p+1
        n = 2
    if p > x:
        break
print(PRIMES)

the program works okay, but it says, that some numbers are primes, which are just no primes. (For example 27)
So I would love it, if you could have a look for the program and tell me what mistake I have made.

Greets, ixaM

PS: You may have found some vocabulary or grammaticly mistakes in the text. Keep them with u :) I am not from an englishspeaking country, so yeah, my english is kinda bad. :(