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# One-liner to check if a number is prime

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This lambda function uses a list comprehension to check if the number x is divisible by any number from 2 to the square root of x, plus 1. If x is not divisible by any of these numbers, it returns True, indicating that x is prime.

```
is_prime = lambda x: all(x % i for i in range(2, int(x ** 0.5) + 1))
```