Depends on what you mean. The first even number can be 0.2 or lesser. If you do not include decimal points, then I think zero is the first even number.
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Zero is an even number, as 0x2= 0.
Zero is an even number but it is not composite (nor prime).
Zero is an even number.
Zero is an even number, but to say even numbers start with zero does not take into account even negative numbers. Zero is an even number on an infinite list of even numbers that has no beginning and no end.
Any even number minus another even number is either even or zero. Any odd number minus another odd number is also either even or zero.