Hi guys, im still new so i dont know how does this work to solve the following question.

Why is there a need for it to square root?

```
"""By listing the first six prime numbers: 2, 3, 5, 7, 11, and 13, we can see that the 6th prime is 13.
What is the 10 001st prime number?"""
def is_prime(x):
div_by = [i for i in range(2, int(x ** 0.5) + 1)]
for i in div_by:
if x % i == 0:
break
else:
return True
primes = []
test = 2
while True:
if is_prime(test):
primes.append(test)
if len(primes) == 10001:
break
test += 1
print('prime list check:', primes[:10])
print('the number of primes found:', len(primes))
print('the 10001st prime:', primes[10000])
```