Unfortunately, No. Any system can get hacked, we cannot eliminate such a possibility. However, we could and should be reducing the possibility of such an incident. Attackers use vulnerabilities to hack, and these originate either from improper / bad code or configurations or through humans via techniques such as social engineering. In either case, vulnerabilities can be greatly reduced by training your workforce, and therefore, by reducing the prevalence of vulnerabilities we can reduce the "attack-surface" of the hacker and greatly reduce the chances of getting hacked.

While having a strong and properly configured firewall, security tools can help in reducing the impact of a cyber-attack or data-breach, by defending your infrastructure and data from the attackers, it certainly cannot prevent an attack. They can only protect you against threats coming via them, but there may be other ways to get into your critical infrastructure.

Perhaps, such systems cannot protect against data breaches and cyber-attacks that penetrate through legitimate credentials of your employees or clients, which could happen through phishing, social engineering etc. Nowadays, most companies and devices have firewalls, and bad actors today have evolved to use these alternate techniques to carry out an attack, which unfortunately these tools cannot protect you against these threats.

While having an automated vulnerability scanner for your application and network is certainly good, there are practical limitations to it. A major challenge to its efficiency is how much of your codebase can be covered by these tests, and the intelligence of these scanners to identify your business logics and algorithms.

If you use any device connected to the internet to run your business, then absolutely yes. A study found that 43% of data breaches involved small businesses, as hackers attack and breach small-businesses as they are easy targets. Another study found that over 52% of cyber-attacks in small-businesses happen due to Human error. Therefore, if you run a business that uses technology in any form, cyber-security, especially in today's world, is extremely important.