Several rational numbers are multiplied. When the number of negative factors is odd, the product must be negative. Several rational numbers are multiplied. When the product is negative, the number of negative factors is odd. Are these two sentences right?

Several rational numbers are multiplied. When the number of negative factors is odd, the product must be negative. Several rational numbers are multiplied. When the product is negative, the number of negative factors is odd. Are these two sentences right?

It is not appropriate to use the word negative factor here. It is better to change it to negative.
Several rational numbers are multiplied. When the number of negative numbers is odd, the product must be negative.
Error, possible multiplier is 0.
When the product is negative, the number of negative numbers in the multiplier is odd.
Correct

It is not appropriate to use the word negative factor here. It is better to change it to negative.
Multiply several rational numbers. When the number of negative numbers is odd, the product must be negative.
Error, possible multiplier is 0.
Multiply several rational numbers. When the product is negative, the number of negative numbers in the multiplier is odd.
Correct

Several rational numbers are multiplied. When the product is negative, the negative factor is odd. What does this mean? Why? Several rational numbers are multiplied. When the product is negative, there are odd numbers of negative factors. What does this mean? Why?

Negative factors have odd numbers. That is, these rational numbers have odd negative numbers.
Multiplying an odd number by a negative number, the product is a negative number, and then multiplying by another positive number, the result is of course a negative number.