Please /g/ help me comprehend num = input("Enter a number:

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Please /g/ help me comprehend

num = input("Enter a number: ")
mod = int(num) % 2
if mod > 0:
print("You picked an odd number.")
else:
print("You picked an even number.")

^^^^^^^^^^^^^^^^^^^^^
Why Is It that the number chosen through input divided by 2 has to be greater than 0 to be considered an odd number. 8 divided by 2 Is four, which Is an even number. Could someone explain why this Is?