How to Say "thousand" in Spanish
The most common Spanish word for “thousand” is “mil” — use 'mil' when referring to the number 1,000 itself, or when it functions as an adjective modifying a noun.
mil
meelmil

Examples
Este teléfono cuesta mil euros.
This phone costs a thousand euros.
La ciudad fue fundada en el año mil novecientos.
The city was founded in the year nineteen hundred.
Necesito dos mil dólares para el viaje.
I need two thousand dollars for the trip.
Stays the Same in Plural
Unlike other numbers, 'mil' doesn't change when you put another number before it. It's 'dos mil' (2,000), 'cinco mil' (5,000), 'cien mil' (100,000), etc. The word 'mil' itself stays the same.
No 'Un' Needed
When you mean exactly 1,000, you just say 'mil', not 'un mil'. For example, 'Tengo mil libros' (I have a thousand books).
Saying 'un mil'
Mistake: “Compré un mil cosas en el mercado.”
Correction: Compré mil cosas en el mercado. You only need to say 'mil' for 'one thousand'. The 'un' is not necessary and sounds unnatural.
millar
mee-YARmiˈʎar

Examples
Compramos un millar de hojas de papel para la oficina.
We bought a thousand sheets of paper for the office.
Millares de personas protestaron en las calles.
Thousands of people protested in the streets.
El costo por millar de ladrillos ha subido este mes.
The cost per thousand bricks has gone up this month.
Using 'de' with millar
Unlike the number 'mil', the word 'millar' always needs the word 'de' (of) before the thing you are counting. Think of it like saying 'a group of' a thousand.
Millar vs. Mil
Use 'mil' for exact counting (1,000). Use 'millar' when you want to emphasize the total set or group of a thousand, especially in business or when talking about huge crowds in the plural.
Forgetting the 'de'
Mistake: “Un millar personas.”
Correction: Un millar DE personas. Because 'millar' acts like a regular noun (like 'box' or 'group'), it needs 'de' to connect to the next word.
Mil vs. Millar: Number vs. Group
Related Translations
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