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# Full Prime Number Program in Java

Write a program to input an integer from the user, and check if that number is a full prime.

A number is said to be a full prime if it is a prime number and all its digits are also prime numbers.

For example, 23 is a full prime number because 23 itself is prime, and all its digits 2, 3 are also prime.

``````import java.io.*;
class FullPrime{
public static void main(String args[])throws IOException{
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
System.out.print("Enter the number: ");
int num = Integer.parseInt(br.readLine());
if(isPrime(num)){
int n = num;
loop:
while(n != 0){
int d = n % 10;
switch(d){
case 2:
case 3:
case 5:
case 7:
n /= 10;
break;
default:
break loop;
}
}
if(n == 0)
System.out.println(num + " is full prime.");
else
System.out.println(num + " is not full prime.");
}
else
System.out.println(num + " is not full prime.");
}
public static boolean isPrime(int n){
int f = 0;
for(int i = 1; i <= n; i++){
if(n % i == 0)
f++;
}
return f == 2;
}
}``````

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