What does this boolean “(number & 1) == 0” mean?

Question

On CodeReview I posted a working piece of code and asked for tips to improve it. One I got was to use a boolean method to check if an ArrayList had an even number of indices

Answer 1

Single & means bit-wise and operator not comparison

So this code checks if the first bit (least significant/most right) is set or not, which indicates if the number is odd or not; because all odd numbers will end with 1 in the least significant bit e.g. xxxxxxx1