"1.5k followers" is a shorthand way of expressing the number of followers someone has on a social media platform or any other platform where followers are counted. In this context, "1.5k" stands for 1,500 followers.
The letter "k" represents "kilo," which is a unit of measurement denoting one thousand. So, when someone says they have "1.5k followers," it means they have 1,500 followers. Similarly, "2k followers" would mean 2,000 followers, and so on. It's a common way of simplifying large follower counts and is often used on platforms like Instagram, Twitter, YouTube, and others to indicate the number of people following a particular user or account.