Mortgage is only part of the story. What are your average monthly costs, looking back several years including taxes, insurance, repairs and maintenance? They would need to total well under the rent in order to cash flow positively. Don't forget property management fees of 10-20% of rent. If you paid $625,000, let's spitball $500/mo for maintenance, $750/mo for taxes and $200/mo for insurance. That's $2200+500+750+200=$3650/mo cost. Add in prop management 15% and you need rent of
$4300/mo to break even.
Your mortgage note suggests you borrowed $500,000. If we estimate you put 20% down, that's $125,000 you have invested. If you would like 10% annual return on that, that's $12,500 or about $1000/month or rent of $5300/mo. See the problem?