Return to input if input is incorrect [duplicate]

Not sure how to return to input if the input is not a prime number until it is.

num = int(input("Enter a number: "))
flag = False
if num > 1:
    for i in range(2, num):
        if (num % i) == 0:
            flag = True
            break
if flag:
    print(num, "is not a prime number")
else:
    print(num, "is a prime number")

source https://stackoverflow.com/questions/72310586/return-to-input-if-input-is-incorrect

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