Two of them.
A number can have an infinite number of multiples since multiples are obtained by multiplying the number by a whole number.
Every number has infinitely many multiples.
Any number has an infinite number of multiples.
Nine. The sum of the digits must be a multiple of 9; because of the repeated digits, this is only possible if the first two digits add up to 9.
360 has an infinite number of multiples.
150150 has an infinite number of multiples.
There are an infinite number of multiples of six.
14 has an infinite number of multiples.
67 of them.
There is an infinite number.
No.
Generally four, but sometimes multiples of four.