Is 1978 a prime number?

1 978 is an even number, because it is evenly divisible by 2: 1 978 / 2 = 989.

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• What is an even number?

A number is a perfect square (or a square number) if its square root is an integer; that is to say, it is the product of an integer with itself. Here, the square root of 1 978 is about 44.475.

Thus, the square root of 1 978 is not an integer, and therefore 1 978 is not a square number.

The square of a number (here 1 978) is the result of the product of this number (1 978) by itself (i.e., 1 978 × 1 978); the square of 1 978 is sometimes called "raising 1 978 to the power 2", or "1 978 squared".

The square of 1 978 is 3 912 484 because 1 978 × 1 978 = 1 978² = 3 912 484.

As a consequence, 1 978 is the square root of 3 912 484.

1 978 is a number with 4 digits.

The multiples of 1 978 are all integers evenly divisible by 1 978, that is all numbers such that the remainder of the division by 1 978 is zero. There are infinitely many multiples of 1 978. The smallest multiples of 1 978 are:

• 0: indeed, 0 is divisible by any natural number, and it is thus a multiple of 1 978 too, since 0 × 1 978 = 0
• 1 978: indeed, 1 978 is a multiple of itself, since 1 978 is evenly divisible by 1 978 (we have 1 978 / 1 978 = 1, so the remainder of this division is indeed zero)
• 3 956: indeed, 3 956 = 1 978 × 2
• 5 934: indeed, 5 934 = 1 978 × 3
• 7 912: indeed, 7 912 = 1 978 × 4
• 9 890: indeed, 9 890 = 1 978 × 5
• etc.

• Preceding numbers: …1 976, 1 977
• Following numbers: 1 979, 1 980…

Nearest numbers from 1 978

• Preceding prime number: 1 973
• Following prime number: 1 979

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• 1 978 est-il un nombre premier ?