Square Root of Prime Number Using Command Line Arguments

The square root of a Prime number by checking first if it is a prime number

Write a C program which will check whether a given number N is a Prime or Not. If the Number N is a Prime, then find it’s square root and print that value to the STDOUT as floating point number with exactly 2 decimal precision.
If the number is not Prime, then print the value 0.00 to STDOUT.
The given number will be positive non zero integer and it will be passed to the program as first command line argument.
Other than floating point No other information should be printed to STDOUT.

#include<stdio.h>
#include<stdlib.h>
#include<stdbool.h>
#include<math.h>
bool isPrime(int n)
{
if(n<2)
return false;
int i;
for(i=2;i*i<=n;i++)
{
if(n%i==0)
return false;
}
return true;
}
int main(int argc, char *argv[])
{
if(argc==1)
{
printf("No arguments");
return 0;
}
else
{
int n;
n=atoi(argv[1]);
float sq=0;
if(isPrime(n))
{
sq=sqrt(n);
printf("%.2f",sq);
}
else
printf("%.2f",sq);
return 0;
}
}