Prime Number Logic

int given_no = 8, i = 2, c = 0;
while (i < given_no && c != 1)
{
    if (given_no % i == 0)
        c = 1;
    i++;
}
if (c == 0)
    lblmessgae.Text = "given number is prime";//print statement
else
    lblmessgae.Text = "given number is not prime";//print statement

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