376,400
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1 and 941. It is a prime number.
390, 400
330 is one such number.
All of the four-digit multiples of 400 end in 00.
400 is a composite number because it is divisible by more than two numbers. Because it ends in a 0, the divisibility rules indicate it is divisible by 2, 5, and 10. (It is also divisible by other numbers.) It is not a prime number because a prime number has exactly two factors, 1 and itself.