Check Prime Number

Source:

function isPrime(num){
var n=Math.sqrt(num);
for(i=2;i<=n;i++){
if(num%i==0)
return false;
}
return true;
}

var number=prompt("Enter for test","0");
if(number!=0 && number!=1){
	if(isPrime(number)){
		document.write(number+" "+"Is Prime");
	}else{
		document.write(number+" " +"Is not prime");
	}
}else{
	document.write(number+" " +"Is not prime");
	}

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