How to show that a program is being processed?

Question

I made a program on checking if an user-input number is prime or not. However, when I enter large numbers, it takes a considerable amount of time. What sort of code would help to show the user that his number is being checked? The program is as below:

from math import sqrt as s
from time import time as t
def check_prime(p):
prime = [p]
start = t()
if p > 3:
for i in range(2, int(s(p)) + 1):
if p % i == 0:
end = t()
print('Time taken is', end - start, 'seconds')
prime.remove(p)
break
else:
continue
else:
pass
try:
end
except:
end = t()
print('Time taken is', end - start, 'seconds')
if p in prime:
if p == 2 or p == 3 or (p != 1 and p > 0):
return(f'{p} is a prime number')
elif p <= 0:
return(f'{p} is not in the domain of prime or composite numbers')
else:
return('1 is neither prime nor composite')
else:
return(f'{p} is NOT a prime number')

while True:
p = input('> ')
print(check_prime(int(p)))

Answer 1

Can you specify where exactly should I put that line, so it keeps printing until the result has been determined? 「ＨＡＰＰＹ ＴＯ ＨＥＬＰ」