I need some help with one of my C programs. Please finish the coding or suggest how I should finish it.

Project 1:
I need to print the prime factorization of two numbers the user puts in. I need to use functions and possibly loops. The output should end up like this:
"The prime factorization of 12 is 2*2*3.

/* My name here
* Page 120; #12
*Purpose: To create a program that will
*take user input of two seperate integers and print
*the prime factorization of the two numbers.
*/

#include <stdio.h>

int primefactor(int number);

int main( void )
{
int usrnum1, usrnum2, usrnumX;

printf("So you want two numbers factored.\n");
printf("Give them to me ne by one and I will do the factoring.\n");

printf("\n Number?");
scanf("%d",&usrnum1);
printf("\nThe prime factorization of %d is ",usrnum1,primefactor(usrnum1));


printf("\n Number?");
scanf("%d",&usrnum2);
printf("\nThe prime factorization of %d is ",usrnum2,primefactor(usrnum2));

scanf("%d",usrnumX);


return 0 ;
}

int primefactor(int number)
{
return printf("\nThe number is %d",number);

}