问在Python中，函数不能一起运行

EN

RuntimeWarning: coroutine 'prime_number' was never awaited prime_number(multiples)

max = 20
num = 20
multiples = []
prime_numbers = []
def all_multiples(max):
    """finds all whole number multiples of max variable integer 
    and appends to multiples list"""
    for x in range(2, num):
        if max%x == 0:
            print(str(x) + " is a multiple!")
            multiples.append(x)
all_multiples(max)

def prime_number(multiples):
    """filters out multiples list for prime numbers and appends to prime_numbers list"""
    for x in multiples:
        if x/2 == 0:
            print("not a prime number")
        else:
            prime_numbers.append(x)
            print(str(x) + "is a prime number")
prime_number(multiples)
print(multiples)
print(prime_numbers)