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The prime factorization of 56 is 2, 2, 2, and 7, so there there are two prime numbers, 2 and 7, that can evenly go into 56.
Prime numbers are numbers that can be divided by by only 1 and itself. 494 can be divided by 2, 247 etc. so it is not a prime number.
To find the prime numbers of 56, start with two numbers that when multiplied together equal 56. For example: 2 x 28 = 56. Two is prime, but 28 is composite, so it needs to be factored. 2 x 2 x 14 = 56. Now, 14 is prime, so factor it. 2 x 2 x 2 x 7 = 56. All the factors are now prime, so the prime factors are 2 x 2 x 2 x 7.
Here are some examples. EX:2,3,7,11,13,19 Prime numbers are numbers that are only divided by themselves and one. So any number that can only be divided by 2 other numbers or less is a prime number!
You can only divide prime numbers by 1 and by themselves. 35 can be also divided by 5 and by 7, so, not a prime. 36 can be also divided by 2, 3, 4, 6, 9, 12, 18, so, not a prime. 37 is a prime because it cannot be divided by any other number than 1 and itself.