28 lines
652 B
Markdown
28 lines
652 B
Markdown
---
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title: Number is prime
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tags: math
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expertise: intermediate
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author: maciv
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firstSeen: 2020-10-03T18:03:32+03:00
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lastUpdated: 2020-11-02T19:28:05+02:00
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---
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Checks if the provided integer is a prime number.
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- Return `False` if the number is `0`, `1`, a negative number or a multiple of `2`.
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- Use `all()` and `range()` to check numbers from `3` to the square root of the given number.
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- Return `True` if none divides the given number, `False` otherwise.
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```py
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from math import sqrt
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def is_prime(n):
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if n <= 1 or (n % 2 == 0 and n > 2):
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return False
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return all(n % i for i in range(3, int(sqrt(n)) + 1, 2))
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```
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```py
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is_prime(11) # True
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```
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