Condition-controlled loop

[kouty]

Hi to the forum;
A simple question:
I want to make a prime number checker:
So if I want to test if 25 is a prime number.
i should to verify if 2 is a factor.
if it is not, i verify with 3 and 4 (not my subject if not 4 id included in not 2), and finally 5.

with a for loop,

for i in range (2, 25):
    if 25 % i == 0:
        break
    else:
        print (25, " is a prime number.")

is a wrong code because after testing 25 % 2, the conclusion where that 25 is a prime number.
So it is imperative that the condition controlled loop run's from 2 to 24(I know the exageration but It's not my subject).

What is the right procedure?

[Gribouillis]

The else part must go with the for. It is only executed if the for loop was not interrupted by a break statement

for i in range (2, 25):
    if 25 % i == 0:
        break
else:
    print (25, " is a prime number.")

See the doc https://docs.python.org/3/reference/compound_stmts.html#the-for-statement

[sneekula]

Nicely explained in:
http://www.tutorialspoint.com/python/python_for_loop.htm

[kouty]

Thank so much!
It is precisely the response!
It is a simple trivial question but i don't regret. It's ggod to read a good answer!