True or False in if-else

I am curious about how the for loop determines whether a result of is_even is True or False. Why is_even(i) in the if-statement has result True, but False in the else-statement?

def is_even(i):
    '''input: i, a positive int; returns True if i is even, False otherwise'''
    remainder = i%2
    return remainder == 0

for i in range(50):
    if is_even(i):
        print(is_even(i))
        print(i, 'even')
    else:
        print(is_even(i))
        print(i, 'odd')