I am trying to write some code for project euler problem 10, in which you are required to find the sum of all the prime numbers less than 2 million. Now the code is taking too long to execute. I would like to know how can I improve my code as it did work for prime numbers less than 100.

```
# =================== isPrime Algorithm ====================
# I created this program to check whether a number is prime or not
def isPrime(n):
# Prime number algorithm
if n == 2:
return True
elif n == 3:
return True
else:
for x in range(3, n, 2):
if n % x == 0:
return False
else:
continue
return True
def main():
# Collects the prime numbers between 1 and 100
prime_arr = [] # I used this array just to test I could have easily printed the num in the for loop below
for num in range(1, 101, 2):
if isPrime(num) == True:
prime_arr.append(num)
else:
continue
print(prime_arr)
# Call the main function
main()
```