def is_allowed_specific_char(string):
    import re
    
    get_char = re.compile(r'[^a-zA-Z0-9.]')
    string = get_char.search(string)
    return not bool(string)
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