Learning more than 2 languages opens up a ton of career opportunities. More companies than ever are doing business in several countries around the world, but they can’t do it without hiring globally-minded people who can speak at least one foreign language. Plus,being a multilingual compounds your prospects and give you a sharp edge in the job market. For example, even you are not using Mandarin or Japanese in your work, but writing those on your resume makes you stand from others.
Sure it is very beneficial and will provide you more job opportunities and is good for a lot of jobs in the world today but it is not necessary. There are a lot of people that will only learn one language in their life and that will never have a negative impact on them.