# Check if a number is divisible by another number in Python Last updated: Jul 15, 2022

## Check if a number is divisible by another number in Python#

Use the modulo `%` operator to check if a number is divisible by another number, e.g. `if 9 % 3 == 0:`. The modulo `%` operator returns the remainder from the division of the first number by the second. If the remainder is `0`, the number is divisible by the other number.

main.py
```Copied!```if 9 % 3 == 0:
print('number A is divisible by number B')

if 15 % 5 == 0:
print('number A is divisible by number B')
``````

We used the modulo `%` operator to check if a number is divisible by another number.

The modulo (%) operator returns the remainder from the division of the first value by the second.

main.py
```Copied!```print(10 % 2)  # 👉️ 0
print(10 % 4)  # 👉️ 2
``````

If there is no remainder from the division, then the first number is an exact multiple of the second.

main.py
```Copied!```print(16 % 4)  # 👉️ 0

print(16 % 4 == 0)  # 👉️ True
``````

`4` is an exact multiple of `16`, so `16` is divisible by `4` with a remainder of `0`.

If you need to check if a number is not divisible by another number, use the modulo `%` operator with the not equals `!=` sign, e.g. `if 15 % 4 != 0:`.

main.py
```Copied!```print(15 % 4)  # 👉️ 3

print(15 % 4 != 0)  # 👉️ True

if 15 % 4 != 0:
print('15 is not divisible by 4')
``````

`15` is not an exact multiple of `4`, so dividing `15` by `4` gives us a remainder of `3`.

Here is an example that takes numbers from using input and checks if one number is divisible by another.

main.py
```Copied!```num_1 = int(input('Enter a number: '))
print(num_1)  # 👉️ 16

num_2 = int(input("Enter another number: "))
print(num_2)  # 👉️ 4

if num_1 % num_2 == 0:
print(f'{num_1} is divisible by {num_2}')
``````

The input function takes an optional `prompt` argument and writes it to standard output without a trailing newline.

Notice that we used the `int()` class to convert the input strings to integers.

The function then reads the line from input, converts it to a string and returns the result.

Even if the user enters a number, it still gets converted to a string.

If you need to check if a number is divisible by two or more other numbers, use the `and` operator.

main.py
```Copied!```num = 15

if num % 3 == 0 and num % 5 == 0:
# 👇️ this runs
print('15 is divisible by 3 and 5')
``````

The expression `x and y` returns the value to the left if it's falsy, otherwise the value to the right is returned.

The `if` block is only ran if both of the conditions evaluate to `True`.

Conversely, if you need to check if a number is divisible by `1` of multiple numbers, use the `or` operator.

main.py
```Copied!```num = 15

if num % 10 == 0 or num % 5 == 0:
# 👇️ this runs
print('15 is divisible by 10 or 5')
``````

The expression `x or y` returns the value to the left if it's truthy, otherwise the value to the right is returned.

If either condition evaluates to `True`, the `if` block is ran.

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