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python/snippets/is-prime.md

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+---
+title: Number is prime
+type: snippet
+tags: [math]
+cover: carrots
+dateModified: 2020-11-02T19:28:05+02:00
+---
+
+Checks if the provided integer is a prime number.
+
+- Return `False` if the number is `0`, `1`, a negative number or a multiple of `2`.
+- Use `all()` and `range()` to check numbers from `3` to the square root of the given number.
+- Return `True` if none divides the given number, `False` otherwise.
+
+```py
+from math import sqrt
+
+def is_prime(n):
+  if n <= 1 or (n % 2 == 0 and n > 2):
+    return False
+  return all(n % i for i in range(3, int(sqrt(n)) + 1, 2))
+```
+
+```py
+is_prime(11) # True
+```