Remotely create a number of content databases using New-SPContentDatabase > https://docs.microsoft.com/en-us/powershell/module/sharepoint-server/new-spcontentdatabase?view=sharepoint-ps

New-SPContentDatabase.ps1

# Remotely create a number of content databases using New-SPContentDatabase
# https://docs.microsoft.com/en-us/powershell/module/sharepoint-server/new-spcontentdatabase

$SPServers = @("server1")
$webApp = "https://webapp.domain.com"
$databasesRequired = 10
$databasePrefix = "AG5Q_Prefix_Content"
$databaseServer = "DBserver.domain.com"

# Prepare remote PS session and load SP module     
$remoteSession = New-PSSession –ComputerName $SPServers[0]
Invoke-Command -Session $remoteSession -ScriptBlock {Add-PSSnapin Microsoft.SharePoint.PowerShell;}

# Loop through and create new content databases
for ($i = 1; $i -le $databasesRequired; $i+=1){
    $db = "$($databasePrefix)$(([string]$i).PadLeft(3,'0'))"
    Invoke-Command -Session $remoteSession -ScriptBlock {New-SPContentDatabase $($args[0]) -DatabaseServer $args[1] -WebApplication $args[2] } -ArgumentList $db, $databaseServer, $webApp
}

# Disconnect PS session
Disconnect-PSSession $remoteSession