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18 lines (17 sloc) 382 Bytes
public class Prime {
fun int isPrime(int n) {
if (n < 2) {
return 0;
} else {
Math.sqrt(n) $ int => int upper;
2 => int i;
while (i <= upper) {
if (n % i == 0) {
return 0;
}
i++;
}
return 1;
}
}
}