RosettaCodeData/Task/Conditional-structures/Stata/conditional-structures-4.stata

function isprime(n) {
	if (n<5) return(n==2 | n==3)
	else if (mod(n, 2)==0) return(0)
	else {
		for (k=3; k*k<=n; k=k+2) {
			if (mod(n, k)==0) return(0)
		}
		return(1)
	}
}

isprime(10^12-11)
  1