def div_even_odd(list1):
    
    first_even = next((el for el in list1 if el%2==0),-1)
    first_odd = next((el for el in list1 if el%2!=0),-1)
    return (first_even/first_odd)
def is_not_prime(n):
    import math
    
    result = False
    for i in range(2,int(math.sqrt(n)) + 1):
        if n % i == 0:
            result = True
    return result