It is well shaped for it but materials (titanium + graphite) aren't good enough.
However it does follow some fundamental stealth rules when it comes to controlling the scatter of radar waves.
So back in the days it could be called stealth, today... not very much so.
Black
3.5
2193 mph
2200 mph
Stratosphere
The SR-71 Blackbird was introduced into service in 1966.
It is the Lockheed SR-71 "Blackbird", a reconnaissance aircraft.
No it just flew very high to avoid radar.
About 3 times the speed of sound. (3 mach)
No it is an advanced, long range, Mach 3+ strategic reconnaissance aircraft.
titanium
The SR-71 Blackbird primarily operated in the stratosphere, which is the second major layer of Earth's atmosphere. This layer is characterized by high altitudes, low air pressure, and stable atmospheric conditions - ideal for high-speed, high-altitude flight capabilities of the SR-71.