Why my bitcoind cannot query all the blocks?
That's because although the Bitcoin blockchain has a current height of 574080, your full node has synced until 195807 (the output "blocks": 195807 after running getblockchaininfo command). Block 195876, the one that you are querying, has not synced yet on your node. As you said, you have just installed Bitcoin Core. It take  many hours (or sometimes days depending on your machine) for the node to reach the tip of the blockchain. It is not the size of the blockchain that makes it take so long time, but because your full node will go through every transaction since the genesis block and make sure that they confine by the consensus protocol.