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6 years ago
## isprime
### Instructions
Write a function that returns `true` if the `int` passed as parameter is a prime number. Otherwise it returns `false`.
The function must be optimized in order to avoid time-outs with the tester.
4 years ago
(We consider that only positive numbers can be prime numbers)
6 years ago
### Expected function
```go
func IsPrime(nb int) bool {
}
```
6 years ago
### Usage
Here is a possible program to test your function :
```go
package main
import (
"fmt"
piscine ".."
)
func main() {
fmt.Println(piscine.IsPrime(5))
fmt.Println(piscine.IsPrime(4))
}
```
And its output :
```console
student@ubuntu:~/[[ROOT]]/test$ go build
student@ubuntu:~/[[ROOT]]/test$ ./test
true
false
student@ubuntu:~/[[ROOT]]/test$
```