**Python Program to Print all Prime Numbers in an Interval**: In this program, you’ll learn to print all **prime numbers** within an interval using for loops and display it.

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 Print all Prime Numbers in an Interval**

**Source Code**

```
# 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 of Program**