A business has a netloss of $419.18 Does that mean the breakeven is 419.18?

It means that everything the business took in was $419.18 less than everything it spent to be in business during the same period of time. It doesn't tell you what either of those amounts was. Just the difference between them.

No. The break-even is always equal to zero, meaning you did not lose money or make money, you just broke-even.