[Python] Trying to create an odd even function

i am trying to create a function where when i call the function it prompts the user to enter an integer and returns whether it is even or odd. i am trying to make it so that my code prints an error to the console when nothing is entered or when a string is entered, i have gotten it to the point whereby if i enter a number it returns number, "is an even number" if it is even and number, "is not an even number" if it is not even here is my code below i am using python 2.7.3

def is_even():
x = int(raw_input("Enter number"))
if x % 2 == 0:
return x, "is an even number"
else:
return x, "is not an even number"

print is_even()

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