Iran says all of its missiles are created to carry conventional warheads only and has limited their range to a maximum of 2,000 km, although commanders say they have the technology to go further.
During the parade on Friday, Tehran also displayed other ballistic missiles, which reportedly have a range of 1,300-2,000 km.
Iran's state media showed video on Saturday of the successful test-launch, saying the missile had a range of 2000km.
He also criticized the 2015 pact that the United States and other world powers struck with Iran under which Tehran agreed to restrict its nuclear program in return for relief from economic sanctions.
The test firing is likely to fuel tensions with Washington.
Iran says it's successfully tested a new ballistic missile with a range of 2,000 KM.
But it also has said that Iran's missile program violates the spirit of the nuclear agreement. "Not much of an agreement we have".
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Rouhani has said that the Trump administration is seeking "an excuse" to pull out of the landmark 2015 nuclear agreement that capped Iran's nuclear activities in return for the lifting of worldwide sanctions on Iran.
"Not much of an agreement we have!" the President added in his tweet, apparently alluding to the agreement signed in 2015 between Tehran and six worldwide powers, including the United States, on Iran's nuclear programme.
"We will certainly reinforce our own protection in addition to army capacities ... regardless of whether you desire it or not", Rouhani mentioned, a direct reaction to Trump's dialog in the United nations General Assemblage recently.We will not seek permission from anyone to defend our country.
The Khorramshahr is a long-range ballistic missile that can carry multiple warheads.
President Hassan Rouhani made the statements at a military parade in Tehran in direct defiance of USA demands.
The US has placed a number of sanctions on Iranian individuals, businesses and institutions in response to its missile tests.
But Rouhani ruled out any change of policy in the region.