is 400 a prime number?

Hi dear Hi ;
of course not . 400 isn't a prime number.
{ A prime number is a positive integer that has exactly two positive integer factors, 1 and itself. For example, if we list the factors of 28, we have 1, 2, 4, 7, 14, and 28. That's six factors. If we list the factors of 29, we only have 1 and 29. That's 2. So we say that 29 is a prime number, but 28 isn't. }

Good Luck Darling.

2006-10-09 08:07:02 · answer #1 · answered by sweetie 5 · 6⤊ 0⤋

NO.
400 is not a prime number.

(400=2*2*100=2*2*2*50=2*2*2*2*25=2*2*2*2*5*5-so as per definition of prime no. , 400 is not a prime number.)

(In mathematics, a prime number (or a prime) is a natural number that has exactly two (distinct) natural number divisors, which are 1 and the prime number itself. There exists an infinitude of prime numbers, as demonstrated by Euclid in about 300 B.C.. The first 30 prime numbers are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, and 113 )

2006-10-09 08:10:40 · answer #2 · answered by Anonymous · 0⤊ 0⤋

No, because 2 x 200 = 400

A prime number is defined as a number that can only exist in the components of itself and 1.

Example:
2 x 1 = 2 --> prime
3 x 1 = 3 --> prime
1 x 4 = 2 x 2 = 4 ---> not prime

2006-10-09 08:05:07 · answer #3 · answered by ohmneo 3 · 0⤊ 0⤋

400 is not a prime number. (See all the other answers to find out why. They are all right.)

However, 400 is a perfect square. 20 x 20 = 400.

2006-10-09 08:11:04 · answer #4 · answered by Anonymous · 0⤊ 0⤋

no prime numbers are numbers that can't be divided equally like 7 or 11. 400 can be divide by 2 to get 200 and that by 2 to get 100 and so on.

2006-10-09 08:04:24 · answer #5 · answered by tjnw79 4 · 0⤊ 0⤋

No; a prime number is a number that can only be divided by itself and one. 400 can be divided by a lot of numbers. Besides the number 2, no even number is also a prime number.

2006-10-09 08:03:43 · answer #6 · answered by Joy M 7 · 0⤊ 0⤋

No, it is a product of several numbers:
2 * 2 * 2 *2 *5 * 5 = 400

2006-10-09 08:03:42 · answer #7 · answered by Jim 5 · 0⤊ 0⤋

No, prime numbers are never even. (400 is an even number.) this is the first sign of a number not being prime, a number that isn't prime is composite.

Prime and Composite Numbers
Natural numbers are the set of numbers we use when we count.
{1, 2, 3, 4, 5, 6, 7, …}
A prime number is a natural number that can be divided, without leaving any remainder, by only itself and one.
A prime number has only two factors, itself and one.
For example, 5 can be divided, without a remainder, only by 5 and 1.
5 has exactly two natural number factors, 5 and 1.
5 is a prime number.

A composite number is an natural number that can be divided, without leaving any remainder, by a natural number other than itself and one.

2006-10-09 08:02:55 · answer #8 · answered by Anonymous · 0⤊ 1⤋

no number is a prime number if it can be divided by another number with no remainder (other than the number 1). However, there is one even, prime number: 2.

2006-10-09 08:10:04 · answer #9 · answered by JLT 2 · 0⤊ 0⤋

NO, because you can divide it by other numbers than 1 or itself (namely, by 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 200).

2006-10-09 08:05:01 · answer #10 · answered by dutch_prof 4 · 0⤊ 0⤋

is 400 a prime number?

22 answers