Help to understand prefix-list

Hi, I am receiving below routes from BGP neighbor: 10.240.6.0/24 10.240.2.0/24 10.240.0.0/23 10.240.3.0/25

If I add prefix list entry: permit 10.240.0.0/19 deny 0.0.0.0/0 le 32

will I block mentioned prefixes from neighbor? I should look at two octets to be 10.240.X.X/19? If there would be for example 10.240.5.0/19 there would be match? Thank you in advance