Yes, he had a wife and many children; he remarried after his first wife of 40 years passed away.
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e isn't a number, its a mathematical constant. It is sometimes called Euler's number after the mathematician Leonhard Euler.
Leonhard Euler
The mathematician William Jones first used the Greek letter pi in 1706. In 1707, the great mathematician Euler popularized it.
Leonhard Euler, a aswiss mathematician, started to use the letter e for the constant in 1727. The first book mentioning it is Euler's Mechanica (1736)
Euler.