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Write a program that prompts the user to input a positive integer. It should then output a message indicating whether the number is a prime number. A prime number is a number that is evenly divisible only by itself and 1. For example, the number 5 is prime because it can be evenly divided only by 1 and 5. The number 6, however, is not prime because it can be divided evenly by I, 2, 3, and 6.

```
num=int(input("Enter number: "))
k=0
for i in range(2,num//2+1):
if(num%i==0):
k=k+1
if(k<=0):
print("Number is prime")
else:
print("Number isn't prime")
```