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home / developersection / forums / how do you check if a given number is prime in python?
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Utpal Vishwas
Utpal Vishwas

Student

I am Utpal Vishwas from Uttar Pradesh. Have completed my B. Tech. course from MNNIT campus Prayagraj in 2022. I have good knowledge of computer networking.

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1 Answers

Aryan Kumar
Aryan Kumar 27 Jun 2023
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def is_prime(number):
  if number < 2:
    return False

  for i in range(2, int(number ** 0.5) + 1):
    if number % i == 0:
      return False

  return True


if __name__ == "__main__":
  number = 11
  print(is_prime(number))

This code works by first checking if the number is less than 2. If it is, the function returns False, because no number less than 2 is prime. Otherwise, the function iterates through all the numbers from 2 to the square root of the number, and checks if any of them are factors of the number. If any of them are factors, the function returns False. Otherwise, the function returns True.

Here is an explanation of the code:

  • The is_prime() function takes a number as its input.
  • The if number < 2: statement checks if the number is less than 2. If it is, the function returns False.
  • The for i in range(2, int(number ** 0.5) + 1): statement iterates through all the numbers from 2 to the square root of the number.
  • The if number % i == 0: statement checks if any of the numbers in the range are factors of the number. If any of them are factors, the function returns False.
  • The return True statement returns True if the number is not divisible by any of the numbers in the range.
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