SIP providers usually sell numbers in contiguous series for businesses. For example, if your company buys a block of 50 numbers, the SIP provider then allocates XXX-5100 to XXX-5150.
But since you’re keeping this strictly internal, you don’t have to worry about that.
Only for version updates. Beyond that, dnf-automatic handles those invisibly in the background. I only notice them when Firefox gets an update and demands a relaunch before it lets me keep browsing.