Given a number, it is determined whether the prime number

import math

def isprime(n) :
    a=0
    # print(n)
    if int(n)==2 :
        a = 0
    else :
        # print("i will program this ")
        for i in range(2,math.ceil(int(n)**0.5+1)) :
            if int(n)%i==0 :
                a = 1

    if(a):
        print("It is not a prime !")
        print('')
    else :
        print("It is a prime !")
        print('')
def program():
    while(1) :
        n = input("请输入一个整数：")
        isprime(n)

program()