Nope - Best answer from Quora:
Al Danoli
Former Person Who Did Many Things before Retiring Early (1982-2018)
Updated October 31, 2019
The answer to your question depends on how long the term of office was that the VP finishes out. The Twenty-second Amendment says that no person can be elected President more than twice, and no person who has served more than two years of a presidential term to which someone else was elected (i.e., the president whom the vice-president succeeds) can be elected more than once.
Thus, Lyndon Johnson served out the approximately one year remaining in JFK’s first term when Kennedy was assassinated in 1963. Johnson was elected to his own full term in 1964, and was widely expected to run for a full second term in 1968; that’s why his decision to drop out of the race in March, 1968 created such shockwaves at the time.
His unpopularity because of the Vietnam War made it unlikely that Johnson would have been reelected in 1968, but given the way that delegates were chosen to the Democratic Convention, he probably would have gotten the 1968 nomination if he’d pursued it. Nevertheless, if Johnson had been elected in 1968, he would have been the first president since FDR (indeed, only the second in U.S. history) to serve more than 8 years in office.
Compare that with Gerald Ford, who became president in August, 1974, about 18 months into Richard Nixon’s second term. Ford served about two and-a-half years of Nixon’s remaining term. He ran, unsuccessfully, for his own full term in 1976. Had Ford been elected (and he came close), he would have been ineligible to run in 1980 or thereafter even though he would have formally been elected only once. (Ford remains the only person ever to become president without having been elected president or vice-president.)
Thus, Ford would have been the first president made ineligible by the Twenty-second Amendment to serve even eight years. He would have been constitutionally ineligible after serving only six and-a-half years, had his 1976 election come to pass.
