Is Prime Approach

In this lesson, Alvin explores the strategy to solving the following interview problem:

Write a function, is_prime, that takes in a number as an argument. The function should return a boolean indicating whether or not the given number is prime.

A prime number is a number that is only divisible by two distinct numbers: 1 and itself.

For example, 7 is a prime because it is only divisible by 1 and 7. For example, 6 is not a prime because it is divisible by 1, 2, 3, and 6.

You can assume that the input number is a positive integer.

is_prime(2) # -> True

is_prime(3) # -> True

is_prime(4) # -> False

is_prime(5) # -> True

is_prime(6) # -> False

is_prime(7) # -> True

is_prime(8) # -> False

is_prime(2017) # -> True

is_prime(2048) # -> False

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