Yes and no.
In a very general conversationalist context, we could say, "yes" because it just it a lot simpler for a person to understand without all the wordy scientific jargon getting in the way. However, if we're wanting to be a whole lot more science-y and technical, the answer would definitely and positively be, "No."
Technically and anatomically speaking then, cows actually only have one stomach with three additional fore-stomachs that are extensions and modifications of the esophagus. (See how wordy and cumbersome that is in a normal conversation?) Put another way, and a little more simply, a cow has one multi-chambered stomach.
That's what makes a cow a ruminant. They need those multiple chambers, which house billions of microbes, for them to eat and digest the grass and other herbage they consume as herbivores. For more information on the functions of the ruminant's stomach chambers, please head on over to the question How many stomachs does a cow have?
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