Function to check for a prime number with python

Below is a simple function to check for a prime number. The function is_prime_number() returns False if the number supplied is less than 2 and if the number is equally divisible with some other number different than 1 and itself. If none of the previous conditions apply the function will return True. The below python script will let user to decide how many numbers needs to be check to see whether the number is prime number:

#!/usr/bin/env python

prime_numbers = 0

def is_prime_number(x):
    if x >= 2:
        for y in range(2,x):
            if not ( x % y ):
                return False
    else:
	return False
    return True
	        

for i in range(int(raw_input("How many numbers you wish to check: "))):
    if is_prime_number(i):
        prime_numbers += 1
        print i

print "We found " + str(prime_numbers) + " prime numbers."

Save the above script into a file eg. is-prime-number.py and make it executable:

$ chmod +x is-prime-number.py

Next, execute the is-prime-number.py python script to search for a prime number within first 100 numbers. The output will print all prime numbers between 0 and 100.

---

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$ ./is-prime-number.py 
How many numbers you wish to check: 100
2
3
5
7
11
13
17
19
23
29
31
37
41
43
47
53
59
61
67
71
73
79
83
89
97
We found 25 prime numbers.

On the below image you can see the output of a search for all prime numbers between 0 and 1 milion: