//THIS FAILED
for(number = 0; number < 100; number++)
  {
    if(number > 1 && number / number == 1 || number / 1 == number)
    {

      Serial.print(number);
      Serial.println(" prime");
    }
    delay(1000);
  }

// THIS ALSO FAILED
if(number > 1 && number / number == 1 || number / 1 == number)
  {
    Serial.print(number);
    Serial.println(" prime");
  }
  number = number + 1;
  delay(1000);