$read number;result=`factor $number | wc -w`; [ $result = "2" ] && echo "$number is prime Number" || echo "$number is not prime number" ; echo "Factors of" `factor $number`
78
78 is not prime number
Factors of 78: 2 3 13
$read number;result=`factor $number | wc -w`; [ $result = "2" ] && echo "$number is prime Number" || echo "$number is not prime number" ; echo "Factors of" `factor $number`
13
13 is prime Number
Factors of 13: 13

$ for i in `seq 1 10`; do result=`factor $i | wc -w`; [ $result = "2" ] && echo "$i is prime Number" || echo "$i is not prime number" ; done
 
1 is not prime number
2 is prime Number
3 is prime Number
4 is not prime number
5 is prime Number
6 is not prime number
7 is prime Number
8 is not prime number
9 is not prime number
10 is not prime number

$ for i in `seq 1 10`; do result=`factor $i | wc -w`; [ $result = "2" ] && echo "$i is prime Number"; done
2 is prime Number
3 is prime Number
5 is prime Number
7 is prime Number