Square taper is a pretty common type of bottom bracket. There are a few different types of square tapers within that class, all using different lengths and stuff (such as Japanese International Standard, or JIS). If you pair the Shimano crankset with the Shimano bottom bracket it specifies in the crankset instructions, you'll have no issue. As long as you get the size right. The axle and body lengths are variable. A local bike shop should measure it for you for free and tell you what size you need.