No it is not, The Oral law called the Mishna teaches that Rabbinically it is prohibited because in the old days "breaking Bread" was a respectful and intimate meeting and the rabbi's feared eating their bread may lead to sharing their bread wich may lead to intermarriege so the Rabbi's forbade it and forever after made Non Jewish Bread not Kosher and the name of prohibition is Pat Akum in hebrew.  BUT the Rabbi's also understood the importance of bread especially in thosae days when it was the main staple and enacted several failsafes into their decree which are

1. If a jew took part in the baking process even as minimal as tossing a wood peice into the fire it's kosher

2. A seperate law states that if the masses refuse to accept a law do to hardship, that was instituted by the Rabbi's that law is automatically nullified.  There fore in far flung villages where it was difficult to follow the decree so they didn't, it is considered kosher

3. The bread of a non-Jew is forbidden only when it is made of one of the five species of grain: wheat, barley, spelt, rye and oats, but bread made of pulse, like beans, peas, etc., is not considered bread; neither can it be forbidden as food cooked by a non-Jew, since such food is not fit to be served on “the table of a king.”

I have simplified and watered down a very lengthy topic I hope it was clear