Probably not. It's important to remember that while Flynn might have been a part of the Russia probe in general, the Russia probe is what's called a counterintelligence investigation.
The FBI has been responsible for identifying and neutralizing ongoing national security threats from foreign intelligence services since 1917, nine years after the Bureau was created in 1908. The FBI’s Counterintelligence Division, which is housed within the National Security Branch, has gone through a lot of changes over the years, and throughout the Cold War the division changed its name several times. But foiling and countering the efforts of the Soviet Union and other communist nations remained the primary mission.
What's confusing here is that, when people hear the phrase FBI Investigation, they tend to think of criminal investigations. The Russia probe is trying to determine what the Russians did and why they did it. Michael Flynn has not been charged with anything criminal, nor are there any indications that he under any criminal investigation. Had Trump asked for a criminal investigation to be ended, that could easily qualify as Obstruction of Justice.
We already knew Trump disliked the Russia probe, and he has cited that as his reason to fire Comey. But since it's not a criminal investigation, it seems unlikely to rise to an Obstruction charge
Trump is said to have told Comey, “I hope you can see your way clear to letting this go, to letting Flynn go. He is a good guy. I hope you can let this go.”
Other than telling us that Comey replied, “I agree he is a good guy,” the Times provides no context of the conversation. Its report gives no indication of whether the memo provides such context.
On its face, the statement does not amount to obstruction of justice. Trump could be said to be putting pressure on his subordinate, just as Obama was putting pressure on his subordinates (Comey included) last April. But assuming the Times is right about the memo, Trump did not order Comey to drop the case. In fact, Trump’s statement is consistent with encouraging Comey to use his own judgment, with the understanding that Trump hoped Comey would come out favorably to Flynn.
But of course, also with the understanding that if Comey pushed to prosecute Flynn, the president — who had the power to fire Comey — was going to be very unhappy. Just as President Obama would have been very unhappy, and in a position to fire Comey, if Mrs. Clinton had been indicted.