Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
 noun A number that is an exact divisor of another number.
from The Century Dictionary.
 noun A number which divides another without a remainder, or is an aliquot part of it: thus, 7 is a submultiple of 56.
 Noting a number or quantity which is exactly contained in another number or quantity an exact number of times: as, a submultiple number.
from the GNU version of the Collaborative International Dictionary of English.
 noun (Math.) A number or quality which is contained in another an exact number of times, or is an aliquot part of it; thus, 7 is the
submultiple of 56, being contained in it eight times.  adjective (Math.) Of or pertaining to a submultiple; being a submultiple.
from Wiktionary, Creative Commons Attribution/ShareAlike License.
 noun mathematics An
integer that is an exactdivisor of another
Etymologies
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Examples

The grouping formed by the prefix symbol attached to the unit symbol constitutes a new inseparable symbol (of a multiple or submultiple of the unit concerned) which can be raised to a positive or negative power and combined with other unit symbols to form compound unit symbols.

The equivalent can however be determined very accurately, and we have seen that it is some multiple or submultiple of the true atomic weight.

It is evident, therefore, that the real atomic weight of an element must be some multiple or submultiple of the equivalent; in other words, the equivalent multiplied by 1/2, 1, 2, or 3 will give the atomic weight.

Conversions from a multiple or submultiple to the basic units of meters, liters, or grams can be done using the table.

Conversions from a multiple or submultiple to the basic units of meters, liters, or grams can be done using the table.

Now, compounds are known containing sulphur and hydrogen, and, in each case, the weight of sulphur combined with 1.008 grammes of hydrogen is found always to be either 8.02 grammes or some multiple or submultiple of this quantity.

The electric fork makes ½ (256.070 + B + cor.) vibrations per second, and n is a multiple, submultiple, or simple ratio of this.
Experimental Determination of the Velocity of Light Made at the U.S. Naval Academy, Annapolis

This is also the case when the number of turns is a submultiple.
Experimental Determination of the Velocity of Light Made at the U.S. Naval Academy, Annapolis

And this is threefold; integer, fracted, and surd: An Integer is what is measured by Unity, a Fraction, that which a submultiple Part of Unity measures, and a Surd, to which Unity is incommensurable” (Universal Arithme  tick, London [1728], p. 2).

"Ah, you can't deny the charge, you miserable _submultiple_ of a
Irish Wit and Humor Anecdote Biography of Swift, Curran, O'Leary and O'Connell
whichbe commented on the word submultiple
(quantity) dividing into another exactly.
May 16, 2008