In this program, you'll learn to print all prime numbers within an interval using for loops and display it.

To understand this example, you should have the knowledge of following Python programming topics:

A positive integer greater than 1 which has no other factors except 1 and the number itself is called a prime number.

2, 3, 5, 7 etc. are prime numbers as they do not have any other factors. But 6 is not prime (it is composite) since, `2 x 3 = 6`

.

```
# Python program to display all the prime numbers within an interval
lower = 900
upper = 1000
print("Prime numbers between", lower, "and", upper, "are:")
for num in range(lower, upper + 1):
# all prime numbers are greater than 1
if num > 1:
for i in range(2, num):
if (num % i) == 0:
break
else:
print(num)
```

**Output**

Prime numbers between 900 and 1000 are: 907 911 919 929 937 941 947 953 967 971 977 983 991 997

Here, we store the interval as `lower` for lower interval and `upper` for upper interval, and find prime numbers in that range. Visit this page to learn how to check whether a number is prime or not.