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471 B

package is
import (
"math/big"
"unicode"
)
func Digit(s string) bool {
for _, r := range s {
if !unicode.IsDigit(r) {
return false
}
}
return true
}
func Lower(s string) bool {
for _, r := range s {
if !unicode.IsLower(r) {
return false
}
}
return true
}
func Upper(s string) bool {
for _, r := range s {
if !unicode.IsUpper(r) {
return false
}
}
return true
}
func Prime(i int) bool {
return big.NewInt(int64(i)).ProbablyPrime(0)
}